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Guidelines for Inspection of Companion and Commercial Animal Establishments

Various establishments exist in which animals are held for a variety of reasons. Historically, the management and inspection of animals in commerce and in private keeping have involved a considerable degree of arbitrary evaluation based on the personal experience of the vendor, keeper, advisor, or inspector. Accordingly, relevant protocols and standards are subject to considerable variation. Relatedly, diversity of traded and privately kept species generates significant challenges for those responsible for facility management and inspection alike. Animal welfare and public health and safety are constant and major concerns that require objective methodologies to monitor and control. This report focuses on establishments concerned with the boarding, breeding, storage, vending or handover of animals intended for human “companions” or “pets”, and aims to provide universal objective information for essential husbandry, inspection protocols and an allied inspection assessment tool for scoring establishments.


INTRODUCTION
In the UK alone, there are estimated to be ∼5,000 dog breeding centers and 4,500 pet stores (1). At least 13,000 species across all classes, and including domesticated and non-domesticated (wild) animals, are kept for human purposes, mostly as "pets" (2)(3)(4). This diversity of species introduces significant inspection and husbandry problems, for example, difficulties in identifying species and their legality, risk to human health and safety, and biological needs. Welfare of captive animals (notably exotics) is frequently and inherently compromised by captive conditions, for example, inability to exhibit natural behavior such as climbing, flying, and burrowing or to roam freely over large distances, as well as imposed abnormal conditions such as transparent boundaries that are not accepted psychologically by some species (5)(6)(7)(8). In addition, there are important animal and human health issues that require appreciable understanding of risk prevention and zoonotic disease control (9)(10)(11)(12)(13)(14).
Historically, the management and inspection of animal establishments, both in commerce and in private keeping, have involved a considerable degree of arbitrary evaluation based on the personal experience of the vendor, keeper, advisor, and inspector. Relevant protocols and standards are subject to wide variation, both locally and internationally (15). In addition, obtaining objective expert-led and evidence-based material uncompromised by vested interests while combining both essential animal husbandry and inspection guidance is challenging. Highly limited and often regional guidance on animal husbandry and inspection of certain facilities is available [for example (16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)], and although this information is helpful, not all existing guidance is similarly structured or cohesive, and this review may provide an opportunity to ameliorate this situation.
Relatedly, scientific reviews and allied provision of tools for assessing the suitability of species are also available (32)(33)(34)(35). Nonetheless, generalized, internationally relevant, combined husbandry with inspection guidance that includes assessment tools is lacking. Animal welfare and public health and safety must be regarded as constant and major concerns that require objective methodologies to monitor and control.
This report focuses on establishments concerned with the boarding, storage, breeding, vending or handover of animals intended as human "companions" or "pets", and aims to provide universal objective information for both inspection protocols and essential husbandry. In order to enhance objectivity for any inspection process, we have proposed a novel scoring system. Using this scoring system, a "traffic light, " "star rating" or simple 0-3 number ranking can be utilized to "flag" or grade the facility in a manner not dissimilar to that adopted for restaurants and other establishments.

METHODS
We conducted an online literature search using Google Scholar, EMBASE, MEDLINE, Royal Society of Medicine, VetMed Resource, and Murdoch University and used the following key terms: animal, establishment, inspection, guidelines, companion, pet, best practice, husbandry, boarding, breeding, storage, wholesale, retail, vending, enforcement, licensing; with a key objective being to identify items that fulfilled our "three-asset" resource target-namely resources that addressed guidance regarding animal husbandry, inspection, and provision of a relevant assessment tool to aid the guidance. Twenty three publications of prima facie relevance were identified and reviewed for content that included combined guidance on animal husbandry and facility inspection, together with provision of an allied inspection assessment tool. Fifteen articles and reports were considered to be cogent. None of the identified items achieved the "three-asset" resource target. Essentially, the most welfare generous recommendations were selected from any reviewed publication. In addition, a working consultation group of independent experts familiar with animal husbandry and inspection provided input and also conducted reviews of the present guidelines thereby allowing high-level impartial experiential contributions in all relevant areas. Accordingly, this review primarily utilized literature-based evidence, and secondarily expert-led, experiential-based information, particularly in respect of the specific guidance sections.
Our research and review found several areas, for example those of relevance to establishment layout and quarantine protocols, where significant information was unavailable. However, these areas are important aspects of animal husbandry. Therefore, in areas of such information deficiency we have drawn on group consensus, some of which arguably is also "common sense, " for example avoidance of unnecessary environmental disturbances and other rational approaches to management.

INTERPRETATION
Terms used in this document are not intended to offer legal definitions, but are descriptions intended to clarify relevance and focus for both animal establishment managers and inspectors. Accordingly, meanings of the terms used herein are as follows: "Animal establishment": any operation or premises including pet stores, boarding facilities, breeders, and rescue shelters or "sanctuaries" in which "companion" or "pet" animals are kept or intended to be kept for any period whether for commercial or other reasons, and that may be required to undergo inspection. "Companion" or "pet": any animal kept or intended for personal, pleasure, or ornamental use rather than for agricultural food, sport, public exhibition, or research and experimental purposes. "Handover": the passing of an animal from an establishment to a recipient, whether the recipient is another establishment or individual for any reason including sale, donation, and post-boarding release.

RELEVANT LAWS, REGULATIONS, AND DUTY OF CARE
Laws and regulations vary considerably across different nations and regions, therefore, it is essential that users of these guidelines independently ascertain any relevant legal requirements. It is beyond the scope of this article to attempt to present and discuss international regulations, laws, and cultural issues. Our aim is that, regardless of whether or not legal and cultural issues are well defined in a region or country, these guidelines may become aspirational and assist at some level to augment any structure or intention to determine or improve relevant issues. Animal establishment inspectors and managers have a legal or moral "duty of care" toward animals and the public, and should take reasonable steps in all circumstances to meet the welfare needs of the animals and to safeguard public health and safety to the extent required by good (preferably best) practice (36). Whether or not specific legal provisions are in place in any area, we recommend that certain foundation principles for laws, regulations and protocols necessarily include set obligations.
For example, in respect of animal welfare, The UK Farm Animal Welfare Council established the Five Freedoms for animal well-being (37), which are used here along with some elaboration by both The Farm Animal Welfare Council (38) and the Royal Society for the Prevention of Cruelty to Animals (39): Five Freedoms: 1. Freedom from hunger and thirst-by ready access to fresh water and a diet to maintain full health and vigor; 2. Freedom from discomfort-by providing an appropriate environment including shelter and a comfortable resting area; 3. Freedom from pain, injury or disease-by preventing them from getting ill or injured and by making sure animals are diagnosed and treated rapidly if they do; 4. Freedom to express normal behavior-by providing sufficient space, proper facilities and company of the animal's own kind (added: where appropriate); 5. Freedom from fear and distress-by ensuring conditions and treatment, which avoid mental suffering.
These criteria were further updated by the FAWC (40) to include providing animals with a good quality of life, and animals that did not have an overall good quality of life should be viewed as below the legal threshold. Public health and safety considerations are fundamental remits of responsible governance and do not need elaboration, save as to emphasize that disease prevention and control should be central, and comprehensively applied to any activity that involves animal vending, keeping, inspection, and enforcement (6,41).

GENERAL ASSESSMENT
Animal establishments should provide conditions consistent with best practice for intrinsic animal welfare reasons, but also because prospective acquirers of animals may regard the conditions in which livestock are kept and observed as examples demonstrating appropriate long-term care (6). Also, animals in temporary facilities may actually reside or remain there for relatively long periods, and therefore they ought to benefit from conditions that are appropriate for long-term captives (42). Conditions for animals at establishments should be exemplary in aiming to provide observers or purchasers with practical solutions that are appropriate for long-term animal husbandry, and not merely provide overly basic "temporary-style" conditions (3).

ESTABLISHMENT AND MANAGEMENT PROTOCOLS
An establishment or facility may be assessed for its suitability whether or not animals are present. Therefore, the general facilities (including all enclosures, and management protocols) should be established for inspection (43).

Layout
The layout of the establishment must be assessed with the primary principle being the welfare of the animals. The atmosphere should be calm and quiet. The ambient lighting should be soft. Included in the assessment should be the ease of access for monitoring of the animals and cleaning of facilities. General positioning of cages should avoid undesirable potentially stressful situations where the presence of relevant predatory species may lead to stress in relevant prey species (20). Accordingly, prey should be protected from visual, auditory or olfactory stress associated with potential predatory species (20). For example, the positioning of feline species within sight of most avian or small mammal-rodent species should be avoided, which should also minimize olfactory perception.
Cage stacking should be such that it avoids the risk of cross contamination, for example, feces, food, water, or substrate dropping into a cage from above. Animals must not be situated "too low down" where they may experience fright and stress from visitors or passers-by (for example, on the floor) (44). Cages should not be positioned where they can be easily and accidentally knocked or kicked, for example, in walkways or near doorways (44). The entry and subsequent passage of sunlight through widows should also be considered in relation to cages and the possibility of light disturbance or overheating (45). Similarly, cages should not be placed in close vicinity of heating elements or in the direct pathway of drafts to avoid these potential stressors (45).

Staff
Staff should be sufficient in number and adequately qualified or experienced to maintain good supervision of both the premises and all animals (46). Where qualifications are required by law there should be evidence that the required pass level has been achieved. The holder of the qualification should be in a senior position at the establishment. Evidence of training protocols and details of training course attendance must be available. General knowledge should be checked at any inspection as well as evidence to convey that it is used effectively (20). Suitably trained and competent staff must be in charge of the animals at all times (20,47), and be available 24/7 whether onsite or within nearby distance of the establishment. Deputization by senior staff to others must only be to suitably trained, experienced, and competent members of the team. Experienced staff must be available at all times whether or not the facility is open to the public. There should be evidence of staff rosters and contact details for hours outside of trading. There must be evidence that the animals are checked at least twice daily. Replacement and suitably trained staff should be available at short notice, should a key team member fall ill.

Overall Assessment
Inspection will assess the cleaning protocols and general hygiene conditions for the facility itself. This is separate and distinct from the individual cage cleaning and should be recognized as such by the facility.
The overall assessment will firstly consider general odor. This should be fresh and free from any obvious noxious or foul smell (20,48). Equally it should be clear of an overpowering chemical odor where disinfectant or air freshener may have been used to mask poor hygiene. The general layout and tidiness of the facility should also be considered with an assessment of "cleanability" (20). If a facility is cluttered it will be difficult to clean effectively. An overview of the state of repair of the facility will also help with an assessment of general hygiene, for example poorly maintained or sealed flooring will significantly impair the ability to clean effectively.
In general, good cage hygiene-cleanliness-should be assessed by establishing the absence of foul or atypical odors, infrequency or absence of "smears" and other overt debris on walls and furnishings, absence of "compacted" and thus likely old and soiled substrata, absence of "pest" invertebrates such as mites, flies, fly larvae, and specific feeder invertebrates such as crickets where these are ubiquitous and/or free-running from cage to cage (20). Many pests may require very close inspection of furnishings, substrate and bedding to determine their presence. Water should always be clean and distinctly fresh.
The presence of small amounts of recent species-specific droppings are acceptable, and even recommended, as these may provide familiar chemical cues that animals find calming (49). However, this should not involve widespread soiling of the environment, but merely a discrete "chemical presence" within the enclosure.

Disease Risk Management: People
Precautions should include regular cleaning and good personal hygiene of staff in addition to effective quarantine of incoming groups of animals (50). Enclosures and relevant facilities should be disinfected with appropriate materials as necessary and always between different batches of animals. Disinfectant should be appropriate for the contaminants likely to be encountered as well as safe for the relevant species, which may involve other invertebrates being at risk of exposure to incidental insecticides (51). Staff should pay particularly close attention to hand cleansing between animal enclosures, to prevent cross contamination both of animals and cages, as well as the wider environment. Hand cleansing should include rigorous use of antibacterial soap and water to assist in removing primary debris, and a second cleansing tier using an alcohol-based antimicrobial agent (disinfectant hand gels alone should not be relied on) (14).
If a towel is to be used for drying hands, disposable paper towels should be used in place of "tea towel" type materials because the latter are likely to harbor potential pathogens.
CAUTION: Hand washing offers very limited protection against microbial pathogens and their transmission from animalto-animal, from animal-to-person, or from person to-person. All animals, cages, furnishings, staff (including clothes, hair), and the wider environment should always be considered potentially contaminated with both animal and human pathogens (14).
Signage: Clear signage should be in place cautioning the public with regards to zoonotic infections (52), and the heightened risk to children under five, pregnant women, the elderly, and immunocompromised from direct or indirect contact with animals and the shop environment (14). Table 1 provides a short-list of common examples of animalto-human (zoonotic) diseases that can be displayed in-facility to promote disease awareness.

Disease Risk Management: Animals
The establishment should be registered with a veterinary practice and there should be veterinary input on all aspects of hygiene control (20). Staff should be made aware of zoonotic disease and its transmission (20).
Injured or diseased animals must be assessed and diagnosed by a veterinarian experienced with the species, and any treatment carried out by or under the supervision of such a veterinarian. Diagnoses and guidance on all animal health and disease must be under the control of a veterinarian. A log of all veterinary treatments should be available for inspection (47).
Contact information for all suppliers of animals and foodstuffs, as well as all those to whom animals are handed on (whether or not paid for) must be recorded in order to allow for contact tracing in the event of an epidemiological outbreak (47).

Isolation and Quarantine Facilities
All reasonable precautions must be taken to prevent the outbreak and spread of disease. No animal that is suffering from (or could reasonably be suspected of having come into contact with any other animal suffering from) any infectious disease or which is infested with parasites, shall be brought into or kept on the premises unless effectively isolated and quarantined (20,53). Species mixing is not advised (20). Consider that diseases can spread two ways and may pass from humans to animals as well as the reverse. A protocol for each species should be available for assessment.
Inspection will assess the length of quarantine given to each new batch of animals. Quarantine periods may vary according to the source and the species. Where animals are acquired from reliable distributors, quarantine may reasonably involve a minimum of 7 days. Where the reliability of supply sources is less well known or unknown, generally longer quarantine periods, for example, 30 days minimum (54,55) are prudent; the consensus for this review concluded >30 days as a generalized minimum. However, "lower" vertebrate species with, for example, slow disease onset periods (e.g., reptiles) of uncertain origin and health state should be subjected to a minimal of 6 months quarantine (56). Accordingly, avoidance of disease outbreaks may be beneficially related to long quarantine periods, and such longer periods should be applied unless otherwise advised by a veterinarian.

Food Management
Animal foodstuffs should be stored in pest-proof closable/sealable containers to ensure that food does not unduly spoil. Where refrigeration or freezing of food is necessary, facilities should be inspected for both cleanliness and operation (20). Where live-foods are involved, measures should be taken to ensure that containers are as escape-proof as practicable to prevent uncontrolled proliferation and pest issues (20).
Preparation areas must be away from the public and managed so as to avoid cross contamination. Areas used for cleaning, for example, washing of food bowls, should be separate from food preparation areas. Food or drink for human consumption should never be kept in areas intended for storage or preparation of animal feed.

Supervision
All animals must be under regular supervision (20,47), which should be as minimally invasive as possible. All animals should be checked no less than twice daily. When premises are closed or otherwise unattended (for example at night in some cases), a supervisor should be available who resides within a reasonable distance from the establishment; independent advice from fire service professionals may assist to determine what is a reasonable distance for a supervisor to be away from a particular establishment in order to provide assistance to fire service personnel if needed. However, preferably, establishments should have onsite supervisors 24/7. The establishment must conform to all safety obligations and maintain contact details for independent 24/7 medical, veterinary and fire safety services that must be clearly available for facility staff.

Dangerous Wild Animals (Where Applicable)
Where dangerous wild animals are held at an establishment, all enclosures must be both structurally secure and lockable, and animals as well as enclosure locks must be inaccessible to the public. Accordingly, no enclosures should open directly into the public area.

Waste Disposal
The local authority should be requested to determine suitable waste disposal for the establishment; a list of wastes must be drawn up by the licensee and their disposal agreed with the local authority (20).
A list of wastes may include: soiled animal bedding including feces, urine, and vomit; foods that may have been contaminated; cadavers (dead bodies) of licensed animals, or feed animals; discarded, used animal items such as beds, hides, and toys.

Fire Safety
Staff must demonstrate to the satisfaction of the fire service or other relevant organization that they are at all times capable of safely evacuating all animals (including animals occupying aquatic enclosures) from the facilities in a manner and time frame as determined by the fire service (47).
A fire risk assessment document should be available for inspection, which will be prepared by the licensee and will list the areas of highest risk, as well as how these risks are mitigated. The fire risk assessment document must include a floor plan and details about fire monitoring equipment, fire fighting equipment, and escape routes. The risk assessment may need to be agreed on by the local fire service if not determined by them. Fire fighting and monitoring equipment must be appropriately serviced and maintained.

Electrical Safety
All major electrical systems and fixtures should be installed by registered qualified professionals and certified as being safe on a regular basis. Documentary evidence of installation should be available to the satisfaction of inspectors.
New electrical installations or portable equipment must have installation certification available. It is advised that equipment is regularly inspected and is compliant with all relevant local and national regulations.

License Display
Establishments should publicly display a valid operational license, including on their websites (47).

ANIMALS
An inspection of protocols concerning animal movement, handover and veterinary records is essential along with assessment of the environment and health and welfare of all animals kept at the establishment.

Register of Animals (In/Out)
Establishments must maintain a comprehensive and regularly updated register of animals "in" and "out, " together with contact information concerning both the supplier of animals to the establishment as well as recipients to whom animals are handed over by the establishment. This process is intended to assist with the potential requirement for contact-tracing in the event of outbreak of disease (47).

Veterinary Records
Veterinary records must be maintained for all animals that are under veterinary care and treatment (47). New acquirers of animals must be informed of the health history of animals handed over. Records must be maintained for all mortalities. Undiagnosed mortalities should be subject to veterinary pathological examination.

Transport of Animals
All transportation (and handling) of animals under the control of the establishment, including where handed over to acquirers, must be subject to independently approved (for example by a veterinarian) procedures and compliant with relevant legislation.

Responsible Handover
Impulse buying of animals by the public should be discouraged (4). Animals should not be offered for sale as part of special promotions or as part of other product sales (4). The selling of "starter kits" with animals should be discouraged (4). The establishment must ensure that quarantine periods have been met. Inspectors should assess an establishment regarding its general policies toward imparting responsible animal handover and its emphasis on welfare rather than profit. Puppies should be viewed with their mother, and as much verification as possible undertaken to ensure the relationship is genuine (47).

Sale of Animals/Discharge
Animals should be discharged from the premises only when they are in a healthy state. Details of the animal must be provided to the new owner, including the source of the animal, the duration that the animal was held at the establishment, and any historical health or problematic behavioral issues noted and/or treated whilst in the care of the licensee (4). Animals must only be discharged at the species-specific recommended age (47).

Information/Care Guidance
Information provided to new acquirers of animals must be scientific, evidence-based and independently prepared by relevant recognized experts with no conflict of interest in the nature of the business of the establishment (4). The use of "care sheets" should be guarded due to their typical extremely minimalist content, and only utilized where: a. produced by wholly independents experts with no vested interests; and b. clearly stipulated to be considered in association with more substantial overarching independent expert evidencebased guidance (4). Checklists may be helpful to confirm responsibilities for those acquiring animals. Acquirers of animals should be directed to independent impartial biological and veterinary resources for reliable guidance on all aspects of relevant species biology and husbandry (4). Where possible, new owners should provide evidence of adequate husbandry knowledge for the animal that they are acquiring (47).

Minimum Age of Sale/Handover
Guiding principles must be that the animal to be handed over meets all legal requirements and is capable of self-feeding, drinking, defecating, urinating, moving independently, and appropriately socialized (47). The animal must be free from disease. Relevant vaccinations must be up-to-date. Very young animals, including amphibians and reptiles, are particularly vulnerable to factors such as dehydration and require the ability to hide in response to noxious stimuli. Where applicable the yolk sac must be fully resorbed.

Environment
To be especially meaningful and relevant, guidance ought to be structured on a species-specific basis. However, the diversity of species currently available, as well as the variability of their biological needs and an associated dearth of species-specific information, prohibits highly detailed guidance (4). Also, even where reliable information is available, it would be impossible to present this as guidance within the confinement of a single overarching document such as this. From this, the reader can take several key messages: In captive situations, "proper care" is impossible, but responsible management is feasible (57); Species-specific information is essential (58), although typically unavailable, for estimating detailed husbandry; There are no complete biological and behavioral profiles for any species (57); Animals are probably living under conditions of controlled deprivation, even where the best species-specific information is available (59).
Accordingly, although it is impossible to provide useful detailed species-specific information for the diversity of animals involved, this does not negate the potential benefit of providing broad concepts and principles of care that may at least provide some form of standardized recognition of biological needs, welfare and inspection. It is for all these reasons that this guidance exists. However, this guidance is not a "how to care for animals" instructional, nor is it an animal keeping promotional. Animal establishments exist, and these facilities require better-informed structure and inspection. This guidance is intended to assist those with responsibility for such inspections, as well as those managing establishments that are being inspected, by providing an information framework to enable better-informed decisionmaking and "safety-net" practices to help alleviate especially poor husbandry standards and to promote some fundamental universal management and welfare considerations.

Space
All animals ought to be able to express a natural range of behaviors including free movement, locomotion, climbing, play, and burrowing where appropriate for the species (44,57,(60)(61)(62)(63)(64)(65). For some species, sociality is an essential feature of their biology, which may mean that appropriate social groups must be maintained (66). For other species, solitary lifestyles are either usual or advisable due to probable co-occupant aggression (8,44,65,67).
Enclosures must be of a minimum size that is large enough to allow all animals to easily use any facility (for example, water and feed bowls, heat sources, retreats, basking sites, perches) at any one time, and allow for all normal behavior and exercise, and adequate escape from conspecifics and the public (8). Aquatic and semi-aquatic species must be able to swim adequately. Arboreal and semi-arboreal species must be able to climb or fly adequately thus the vertical dimension of an enclosure must at least match the horizontal dimension (68). For species that live near water the water depth must allow the animal to dive or drop from a suitably elevated position into water without impacting the floor (69).

Calculating minimum space
All animals: floor space must be capable of accommodating a startled animal accelerating, decelerating, and stopping without impacting a boundary (69,70). Figure 1 provides a methodology for calculating general minimum spatial provisions for enclosure sizes applicable to all animals, utilizing the principle of an animal's "size diameter" X 10 to give a general minimum linear dimension value. The diagram is for dimension purposes only and is intentionally drawn without enrichment or material boundaries.

Estimating animal size and applying the system
To estimate the "size diameter" of an animal, either physically measure the animal, or visualize and imagine the animal in a coiled/consolidated or "ball-like" state. For example, a tortoise naturally has an almost "ball-like/consolidated" anatomy and this reveals its "size." At the other extreme, whereas a snake may be observed in a straight-line posture, by "imagining" the snake in a coiled position, this will provide an approximate finding for its size.
Accordingly, for an animal in this actual or imaginary "balllike" state, its diameter can be reasonably estimated. When the approximate size-diameter of the animal has been ascertained, the observer may then multiply the diameter by a factor of 10 to calculate the minimum main linear dimension of the enclosure. However, where very small species and individuals of only a few centimeters are involved see "absolute minimum enclosure size." The following provides some examples for using the "sizediameter" formula. The diagram is intended to depict examples where all animals featured, despite different forms, have approximately the same "size." All animals in this example are intended to have a body-size diameter of ∼15 cm. The enclosure in the example is intended to illustrate 150 cm primary length and height dimensions, with corresponding depth of 60 cm (= 40% of primary dimensions). Where very small species and individuals are involved see "absolute minimum enclosure size." The diagram also intentionally does not include furnishings because it is a spatial reference only.
Example A. tortoise: shell diameter (naturally approximates a "ball-like" shape) 15 cm; X 10 = 150 cm minimum main linear dimension. Example B. snake: straight-line length 120 cm; coiled (approximates a "ball-like" shape) diameter = 15 cm; X 10 =150 cm minimum main linear dimension. Example C. lizard: total length 50 cm; coiled (approximates a "ball-like" shape) diameter = 15 cm; X 10 = 150 cm minimum main linear dimension. Example D. bird: total length 20 cm; "rolled-up" (approximates a "ball-like" shape) diameter = 15 cm; X 10 =150 cm minimum main linear dimension. Example E. kitten: total length 35 cm; "rolled-up" (approximates a "ball-like" shape) diameter = 15 cm; X 10 =150 cm minimum main linear dimension. Example F. fish: total length 30 cm diameter (naturally approximates a "ball-like" shape) = 15 cm; X 10 =150 cm minimum main linear dimension. Note: the tortoise (A), the kitten (E), and the fish (F) images provide examples of animals that are already "ball-like" in image/anatomy, thus these are represented using a single illustration each. Figure 1 represents minimum spatial accommodation. This system ensures at least one "safe" minimum primary dimensions (e.g., main linear and vertical in example). Common sense and reasonable practice determine that although one dimension may be calculated to attain standard minimum spatial provision, this should not be taken to suggest that enclosures maybe elongated and extremely narrow. Reasonable proportionality should be applied using the calculated minimum length or height as a guide. For arboreal and flying species, which may regularly use both ground and elevated positions, the enclosure should comply with the same calculation formula for both vertical and horizontal dimensions. Birds must be able to fly without their wings contacting the sides of the enclosure.

Absolute minimum enclosure size
Where very small species and individuals are involved one must apply the principle of "absolute minimum" enclosure size to prevent, for example, animals measuring only a few centimeters being confined to "micro-environments, " which should be discouraged.
Save as for short-term transportation, no enclosure should be <100 cm at its main linear dimension (82)(83)(84)(85), with other dimensions measuring no <40% of this figure, and where arboreal species are concerned, the vertical dimension should also measure no <100 cm proportionately.

Stocking Densities
The spatial minimum system above (Figure 1) should be adopted in association with the guidance on "Overcrowding and cryptoovercrowding" to assess permissible maximum stocking densities (8).

Overcrowding and crypto-overcrowding
Overcrowding can be considered as having two "forms" "overt overcrowding" and "covert (or "crypto") overcrowding" (8). The number of animals occupying a certain amount of space may allow overt overcrowding to be estimated (8). Whereas cryptoovercrowding essentially refers to the availability of all facilities to all animals when they require access to those facilities (8). Accordingly, an enclosure that appears large and abundant but that lacks the ability to "service" all animals' needs at any time is capable of being overcrowded by its inherent deficiency (8,69). Therefore, in order that a space is not overcrowded it must allow both space to roam as well as possess facilities, e.g., a water bowl or basking site that all animals together at any time can simultaneously use (8).
Note: Summary principles for spatial issues and enclosure size. Estimate animal's body-size diameter in centimeters; multiply diameter by 10 to determine minimum required primary enclosure dimension (e.g., length or height). All other dimensions to be reasonably proportionate to primary dimension (e.g., no less that 40% of primary dimension). No enclosure to have primary dimension <100 cm.
Stocking density: Apply "crypto-overcrowding" principle [i.e., all animals must be able to use all facilities/furnishings (e.g., water bowls, bathing pools, perches, hides, basking sites) at any one time]. Where an enclosure meets this principle its stocking density has not been breached.

Temperatures, Heating, Lighting and Humidity
In the following sections we have adopted deliberately broad criteria utilizing objective data pertaining to heat, light and humidity observed in the natural environment on a "zone-byzone" basis-an approach used as broad guidance in reviewed literature [for example (44,57,58)]. In effect, we have considered the approximate possible ranges of heat, light and humidity to which animals may be exposed depending on region of the world and their essential habits. This approach is extremely challenging because of the inevitable diversity of heat and light levels even within a relatively specific environment, and because the needs of animals also vary substantially, not only on a speciesspecific basis, but also depending on season, animal condition and concomitant biological need.
The levels of, for example, heat and ultraviolet light, in nature may be extreme and avoided by animals at certain times. At other times, suboptimal levels of heat and light may result in deficiencies that cause animals to adopt compensation strategies when environmental resources are more abundant (86). Few detailed guidance reports are available pertaining to recommended levels of UV, although there is some highly limited information for reptiles and amphibians [for example (44,58,87,88)]. In this document we have adopted an ultraviolet light index (UVI) of 0 (zero UV) to 13 (high).
Accordingly, considerable caution must be applied when using thermal and UVI maximums, because these are unlikely to represent species optimal levels (58). Therefore, we have used lower-to middle natural range thermal and UVI indicators to suggest possible "safety net" guidance. Nevertheless, it should be emphasized that the rationale for, in particular, consideration of thermal and UV guidance in this document is that the parameters should be accessible, but not imposed conditions, causing animals to have the ability to voluntarily choose both thermal and UV gradation as much as possible.
Lighting must be appropriate to the species and this should include both appropriate periodicity of lighting as well as take account of diurnal and nocturnal habits (20,58,89). All animals require adequate levels of restful sleep for optimum health (67,90). Accordingly, diurnal species that would normally sleep at night should not be exposed to invasive lighting during this time. Light and heat should not be mutually dependent so that necessary heat is lost when lights are deactivated (20). While hiding areas are important for seclusion, "light-management" should not be relegated only to an animal's ability to withdraw from light. It is always preferable that the ambient environment (in terms of lighting) should be adequately controlled, simulating, as much as possible, natural cycles of light, and dark (58).
For many species, light (in its various forms) is an important component of health (91,92). Light, its type, intensity and periodicity, influences physiological, behavioral and psychological states, as well as aids in the control of topical infections. Too little light of the correct type can result in, among other things, stress, decreased activity and metabolism, and disease. Furthermore, too much light of any form can result in environments that are "photo-invasive" and stressful, and can cause a range of health problems (58,67,92). Ultraviolet (UV) light has varying degrees of significance according to species, and for some species prolonged exposure to UV can be harmful (58). Typically, broad-spectrum "UVB" bulbs are used in artificial environments, and there are many forms available (58). "Open habitat" (such as grassland/prairie and desert) species are naturally exposed to high intensity UV light. These raised levels of UV light are frequently important to these species, and typically these animals possess physiological mechanisms to regulate their condition under such exposure.
"Closed habitat" (e.g., forest, subterranean, and aquatic) species are naturally exposed to lower intensity UV light, and intensive UV exposure may result in eye injuries and otherwise compromise health. High-level exposure to cage-based UV can also harm the human observer's eyes.
Essential UV light requirements may not correspond with the number of daylight hours. In nature, some animals, while active during the day, may not be directly exposed to strong or significant sunlight during this entire period whether due to habitat cover or deliberate heat or light avoidance (for example, reptiles shuttling between sunlight and shade during normal patterns of thermoregulation). Relatedly, captive animal management (according to species) may involve deliberate UV exposure for only a portion of any single day.
Diurnal species requiring UVB lighting should have appropriate UVB emitting lamps. These should be replaced according to manufacturer's recommendations. Mercury vapor or metal halide UVB emitting lamps may also be used to provide a daytime heat source. UV light sources must not be screened by non-UV transmitting glass or plastic (because glass or plastic will absorb or negate virtually all UVB light). The distance from the UV radiation source must not be so close as to expose animals to excessive radiation, nor should it be for excessive periods. Animals should have areas of shade so that they can escape from the light if desired. No species should be subject to persistent invasive light (light bulbs should not be exclusive heat sources and interfere with normal rest). A day/night time period of (50% light/50 dark) is a broad guide, although crepuscular and nocturnal species' habits should be carefully considered.
It is vital that lighting needs according to species are carefully managed. For example, nocturnal, crepuscular (twilight) and subterranean species should not be exposed to excessive levels or periods of light. Nocturnal species in particular, should not be exposed to invasive light on the basis of any display needs of the establishment. While it is important to position enclosures for light-sensitive species in less-invasive areas, this should not be taken to imply merely positioning cages in "dark" areas of a facility. Nocturnal and crepuscular species should have limited light sources dedicated to primarily low-level lighting that includes some UV component. Brighter areas and "warm" basking spots are acceptable, as long as these facilities are not major components of the environment. Significant specific welfare considerations arise in relation to nocturnal and crepuscular species because human activities frequently involve risk of disturbance and stress to animals, and also because keepers are commonly resting during animals' activity period this means that reasonable opportunities for observing normal health and welfare may be confounded.
Optimum temperatures, normal ranges and critical thermal maximums vary considerably with species. Also, constant uniform temperatures (i.e., a single "set" temperature of, for instance 25 • C, across the entire enclosure) are not consistent with good practice in most cases and may result in stress and harm to animals. Therefore, a reasonable variation of temperature within each enclosure may be important for animal health and welfare. Accordingly, these guidelines adopt a precautionary approach. Inspector and establishment manager familiarity with species natural history is an important component of assessment and management.
Humidity is a feature of air-quality and can be important to animal health and welfare (58,67,90). Characteristically, desertdwelling species are adapted to drier low-humidity environments whereas aquatic and rainforest species are adapted to wetter high-humidity environments. Inappropriate humidity can result in stress and disease (58,67,90). Table 2 provides generalized climate zones (daytime air temperatures) as a rough guide to basic humidity values.

Basking sites and heat sources
It is important that basking animals are able to warm their bodies across their entire length as would occur from sunlight in nature, whether in relation to warmth or ultraviolet light acquisition as appropriate (8). For example, several heat sources may be required to span the length of a large lizard or snake; thus should a heat lamp provide only a "spot" on one section of that animal then the heat source should be considered inadequate.
otherwise thermally bland area in a cage may not offer sufficient variation (8,58). Temperatures, UV levels, and humidity should be recorded in the establishment and assessed against acceptable ranges. The housing of any relevant species outside the given range of temperatures should "red-flag" conditions as imminently potentially dangerous. The principle for assessing a minimum standard adequate thermal range should be determined by evidence-based species thermal preferences and/or natural geographic and thermal ranges of species derived from relevant climate map data for regions. Enclosures should possess a thermal gradient (warmer and cooler areas) appropriate to the species.

Light and lighting periodicity
Care should be taken regarding both the period of exposure and the placement of light sources to avoid over-exposure and thermal burns (8,44). For most species, both a daytime (photophase) and a night-time (scotophase) period are important within each 24-h cycle (8). Similar to the good practice of providing a thermal gradient (range of available temperatures within a single enclosure), light (general environmental ultraviolet where appropriate) should also offer a range of intensities rather than a uniform photo-environment (44,58). Table 3 offers a default ("safety net") guide to lighting and its periodicity for animals.
Electric UV bulbs should be checked regularly for their output because the level of UV output will decrease over time. Furthermore, all lighting equipment must be kept free of dust; this is particularly important for UV lighting where accumulated dust will act to absorb the UV and convert it to heat. Handheld UV-monitoring devices are available to establish bulb and environment UV intensity. Table 4 offers a default ("safety net") guide to UV and its intensity for animals based on data derived from primary natural solar radiation in different climates; subterranean and aquatic environments therefore may receive diffuse, little, or no exposure.
Daytime-to-night-time transitions (and vice-versa) that are gradual (such as a progressed by dimmer/control switching) are preferable to sudden "on-off " transitions.

Sound and Noise
Sounds or noises may be gross or subtle elements in an environment that should be carefully assessed for their invasive potential (101). Road traffic, machinery, "white goods" (e.g., refrigerators) and voices may all be relevant audio polluters and stressors. Many, if not most, animals are sensitive and often stressed by invasive sound and noise (102)(103)(104). Relatedly, because different species may be sensitive to different (e.g., airborne, terrestrial, and seismic vibration or aquatic) sounds, an awareness of both species audio sensitivities and environmental noise pollution is essential.
Given the diversity of species in trade and keeping along with respective varying audio sensitivities (as well as information deficits), it is not possible to provide detailed guidance on acceptable sound or "noise" levels. However, broadly speaking, Table 5 may offer general guidance and comparative context regarding audio sensitivities for various animals. Accordingly, Table 5 indicates what certain animals probably can hear or sense, and therefore, what frequencies and intensities of sound may be or probably are invasive. Essentially, sounds audible to species kept (especially higher decibel sounds) should be prevented, and the general environment should be considered as a "quiet place".

Ventilation
Ventilation involves the process (or management) of the medium of air as it affects an animal (20,113). Ventilation in the establishment environment and facilities requires addressing both the biological needs of animals as well as the practical aspects of cage positioning in the wider environment, and may require considerable planning (20). Movement of gasses, airborne particles and heat extraction are also features of ventilation. A variety of mechanical ventilators are available to assist with specific air quality provision.
In essence, air can be thought of as a mixture of gasses and a very light "fluid" environment-almost as if living in very "thin" water. Just as water quality is important to organisms that occupy the aquatic environment, so too air quality is important to animals that occupy the terrestrial and arboreal environments. While many animals, such as domesticated species comfortably share air qualities that match human preferences, others such as some amphibians and reptiles may require highly specific air qualities that differ from typical human preferences. For example, humid, very warm and "static" air environments may be stressful to species adapted to occupying elevated "breezy" arboreal sites. In addition, temperature change, excitement, activity, and processes such as skin-shedding can produce marked respiratory changes in animals that must be accommodated by adequate environmental ventilation. Knowledge of species-specific natural history is important to providing adequate ventilation and to its assessment.
The starting point for adequate ventilation is the general environment of the establishment itself. Unless enclosures are externally ventilated (which is unlikely) then the establishment's ambient air must be of both sufficient quality and throughput. As indicated under "Hygiene, " the presence of odors (especially if malodorous) usually is an indicator of poor hygiene and poor  Table 4, and imply levels at a focal heat and UV site, and does not imply utilizing these levels in the general environment. Derived from reviewed literature (28,65,(104)(105)(106)(107)(108)(109)(110)(111)(112).
facility ventilation. Further, enclosures or other items should not be in positions as to negatively compromise the airflow. As a very basic guide, species with possibly greater thermal and humidity sensitivities, while still being well ventilated, should be maintained in areas that are especially well protected from door drafts, and no species should be subject to "cold air bursts". Fewer enclosures promote better general ventilation. No smoking of tobacco should occur within the vicinity of indoor animals on the precautionary basis that "passive" inhalation may impact on animal health. Little species-specific information is available concerning recommended ventilation levels for the wide variety of animals kept in captivity. However, information regarding laboratory animals (rodents and lagomorphs) held in relatively large numbers in open cages (with consequential relatively high oxygen demands) indicates that general room ventilation should involve 15-20 air exchanges per hour (28). Because this air exchange rate applies to species and numbers of animals that require considerable ventilation, it is likely that this rate is also suitable for other species under normal densities including groups of enclosures, provided that all enclosures have adequate air access ways.

Environmental Enrichment
Furnishings must reflect the habitat and behavioral needs of animals, for example in respect of: terrestrial, burrowing, subterranean, arboreal, climbing, postural-positional, semiaquatic, aquatic characteristics (114). Accordingly, plant life (real or simulated), terrestrial mounds, deep substrates, rocks, as appropriate for the species should be provided in all environments (81,115). Bare and under-stimulating environments should not be utilized (44,116,117). In addition, many animals (including, for example, reptiles, and birds) are known to play, and may require safe "toy" objects to occupy them (118). Open habitat species Soft (play-pit) sand with uncontaminated (e.g., pesticide-free etc.) topsoil @ 50/50 ratio; hay; sphagnum moss; pure/plain (e.g., pesticide-, fertilizer-and vermiculite-free) soil/peat moss.
Aquatic & semi-aquatic species Fully aquatic species require, as environmental enrichment, a base substrate such as gravel or sand, although in very large enclosures and pools, microbially balanced detritus may be appropriate or beneficial. For certain bottom feeding species substrates may also be essential to provide an acceptably naturalistic environment for dietary habits. Substrate-free aquaria may be acceptable only when used for species that do not behaviorally interact with such media for any purposes. Semi-aquatic species should have submerged and dry areas of sand, gravel (too large to ingest) or stone (or combinations) to enable interaction for purposes of display, feeding or seclusion.

Domesticated dogs & cats
Absorbent floor coverings may include newspaper, shavings or hay/straw, but must be changed regularly to avoid soiling and wetting. Soft beddings such as proprietary items, blankets, towels, specialized materials must be available and regularly laundered.

Exercise Facilities
The issue of space and spatial needs are addressed more specifically elsewhere in this document. However, although spatial issues and exercise are clearly conjoined subjects in certain respects, in some circumstances they may be more distinct. Therefore, exercise facilities will be dependent on the species held and may or may not be sufficient as part of the enclosure. Many wild animal species naturally occupy large home ranges (44) that may be considerably greater than those of domesticated animals (8,44). Also, many small species and juveniles or small individuals of large species may be as active as adults and sometimes more so (8,67). Some species, for example bearded dragons, may or may not seek to wander significant distances on a given day, so their "exercise" needs may be unclear, although additional roaming space beyond that provided by the vivarium may be important. For other animals, for example, dogs, exercise arrangements must be in place, which may involve formal lead walks or time in allocated play areas.
using running wheels. Fish are able to exercise in their aquarium, but consideration for size of aquarium will be dictated by the needs of the species. Obviously sedentary and reclusive species
Details of frequency and time of exercise must be recorded. Inspection of exercise areas will be included and evidence of staff exercise rosters and individual exercise logs must be kept.

Substrates/Bedding
Substrates or "beddings" are important or vital for many species as a medium for appropriate behavior, such as hiding and burrowing, as well as for the avoidance of injury when "diving" to the ground from elevated positions, and also for the absorption of waste (117,119). Under natural conditions, biotic (such as microbes) and abiotic (such as climatic) factors control substrate quality. In artificial environments, this natural "cleaning" process is greatly compromised, making human management of substrate very important (117). While it may be tempting to the animal manager to opt for what are often perceived as "easy" substrates (such as newspaper), these materials provide poorly for behavioral needs and indicate lazy management. Furthermore, because these materials are often sourced from public donations, there is no guarantee that they are free from relevant contaminants and potentially toxic compounds. Accordingly, well-managed naturalistic substrates are preferable to clinical conditions other than in exceptional situations, such as specific laboratory or veterinary protocols and are often essential for animal welfare (117). Table 6 offers "default" guidance on substrates for animals (44,117).
Gravel, hemp, wood chips, along with numerous commercial product substrates present highly problematic potentially ingestible materials that should not be used. In addition, certain materials, e.g., cedar wood and certain barks can be toxic. Although some of these do occur under natural conditions for many species, captive animals often ingest harmful substrate incidentally or develop eating disorders termed "pica" and may consume small stones and other items resulting in illness and death.  (1,8,44,57,79,81,115,116). Where any of the above signs are observed, veterinary opinion should be obtained.

Sleeping/Hide Areas
Sleep and rest are fundamental biological needs for all animals and an essential requirement to health (57,90). Good "quality" rest requires seclusion, and thus the provision of appropriate hiding places, which may also include appropriate substrate, as well as freedom from invasive disturbances including light, noise, co-occupant activity, extraneous movement, handling, cage-pests, hunger, thirst, and other factors (57,91,92).

Transparent boundaries
Transparent boundaries (such as glass) commonly result in psychological stress and behavioral and physical problems for certain animals, for example, reptiles (57,69). Where enclosures involve transparent sides these should be masked wherever possible so that the boundary appears "real" and visible to the animal.

Food and Water Hygiene
Written protocols for food and water provision for each species must be available (57,58). This must include types of feed, method of water provision, frequencies, preparation, and cleaning. Food must be prepared in a clean and hygienic area dedicated for that purpose. Hot and cold water must be available. Contamination to and from other cleaning activities and other food preparation areas (for example staff facilities) must be avoided. Water must be fresh. Where tap water is used it should preferably be filtered or have been left to stand for 24 h to reduce possible chlorine products. Food and water vessels must be cleansed with appropriate cleaning agents at least several times weekly.

Food and Water Availability and Appropriateness
Food and water should always be clean and obviously fresh. Considerable diversity exists for feeding habits, and diet must be suitable for the species and provided at sufficient frequency (20,58). Although some animals rarely or possibly never drink standing water (20), it should always available for every animal even where this may involve a small, accessible, water bowl for arboreal or extreme desert-dwelling species. Atomised water may be sprayed into an enclosure during the mornings several times per week to reflect dew, which certain species imbibe (20). For some species, this same process may be used to "mist" the bodies of animals, which then imbibe droplets (20). Shallow pools should be provided for bathing and non-bathing species alike, and body-misting of many species (including reptiles and birds) may be important several times per week.
Water quality for aquatic and semi-aquatic species is important and requires regular monitoring, and a regular water testing protocol should be in place to test for basic parameters of pH, nitrite, nitrate, free-ammonium, and dissolved oxygen (20). Where appropriate hardness and salinity testing should be added.
Appropriate food and water provisions should be made available for all live invertebrates intended as food (20).

Welfare Assessment
Establishment staff should remain constantly and proactively alert for early onset of problems, including injury, ill-health, behavioral, and general environmental problems. The number of animals in an establishment should be proportionate to the ability of the staff to identify emerging problems. Animal welfare may be assessed in different ways, including: behavioral signs (i.e., what animals "do"); physical signs (e.g., injury); physiological signs (e.g., blood, organ tissue; feces, and urine tests); and  physical examination (e.g., handling and clinical assessment). Over 13,000 animal species (4) are kept in captivity, and there is a lack of species-specific baseline physiological data for the great majority of this diversity. Physiological measurements are also often indeterminate for welfare among captive animals, for example due to the similarities between certain stress states [e.g., captivity-stress and excitement for food (8,120)]. Also, invasive physiological investigations and physical handling may involve stress, as well as lack practical feasibility in most situations. Behavior is widely accepted to provide a reliable method for welfare assessment, and both behavior and physical signs allow for overt observation and minimal invasiveness (8,57,69,120). Accordingly, in this article we have focused on behavioral and certain overt physical signs to assess animal welfare.
Tables 7A-F provide basic guidance on using behavioral signs for the identification of stress, and Table 8 provides basic guidance identifying physical signs of discomfort, as well as and manifestations of injury and disease.

Cause/problem keys
The tables (Tables 7A-F) provide a summary of relatively common behavioral signs of welfare concerns and their potential associated problematic causes. Where a "Behavioral sign" is observed (e.g., "Lethargy"), refer to the "Cause/Problem" column (e.g., "1, 6"), and then proceed to the "Cause/problem keys" below the relevant table to find the potential cause or problem.

SCORING THE ESTABLISHMENT USING THE CHECKLIST AND THE "STAR"/TRAFFIC LIGHT SYSTEM
Inspection may apply a "star" or a "traffic light" scoring system to both general and individual sections of an establishment based on 14 categories and 27 subcategories to deliver the relevant "checklist" scores (see Figure 2).
The scoring system is intended to be user-friendly, and the guidance Tables and Figures allow for objective assessment. While primarily intended for use by local authority inspectors, the scoring system may also be of use to establishment managers who may wish to periodically "self-assess" using the same criteria. Figure 2 provides an example checklist that may be used to score the performance of an animal establishment.
Calculating points for a "score" rating.
1. There are 27 scoring categories in the checklist 2. Each category may be awarded a score of 0-3 3. When all categories have been scored, add together all scores 4. In the sample completed checklist (Figure 2) the total points scored = 43 5. Divide the total scored by 27 to find the average score, so 43/27 = 1.59 6. Scores over 0.5 are rounded up, and scores under 0.5 are rounded down 7. In the sample, the score 1.59 can be rounded up to the next whole point or "2" 8. 2 points = 2 "stars" 9. The establishment may be awarded a "2-star" "Good" rating.
An inspector may choose to isolate and score more specific aspects of the establishment's animal facilities, or opt to score on a more generalized basis. If certain parts of the establishment's protocols or provisions are markedly better than others, isolated scoring will help emphasize which areas/enclosures are maybe "exemplary" and which are "poor" and need improvement. In the sample checklist, we have adopted the generalized approach. However, where an inspector elects to isolate and score on a more specific basis, they should use the following method for calculating points and star ratings, For example: 1. There are 30 individual animal enclosures in an establishment 2. 10 receive 1 point each, 15 receive 2 points each, and 5 receive 3 points each 3. Therefore, total points scored for animal facilities = 55 points 4. Divide the total scored by 30 to find the average score, so 55/30 = 1.83 5. Scores over 0.5 are rounded up, and scores under 0.5 are rounded down 6. In the sample, the score 1.83 can be rounded up to the next whole point "2" 7. 2 points = 2 "stars" 10. The establishment may be awarded a "2-star" "Good" rating for animal facilities.
According to the nature of any relevant concern resulting low scores, the inspector should consider what action is appropriate to remedy a situation. Such action may involve providing guidance regarding improvement and set a time limit for compliance, or may involve immediate decisive intervention as may be available.
As a condition of establishment licensing, authorities should consider stipulating the species that may be offered for sale within the formal authority's, or the available inspector's, own competence level (Appendix 1 provides a blank template for use).

Points, Stars, and Traffic Lights
The use of a points and stars system also enables establishments to be rated according to a quick-view color standard for public assurance. Establishments obtaining a zero score involve poor facilities that constitute "poor/fail" and in a traffic lights system (Figure 3) would be assigned a "red light." Whilst an establishment receiving a red light would unlikely wish to display that flag, the absence of any flag would indicate poor performance. Establishments obtaining scores of 1 or 2 leading to "blue/adequate" or "green/good" flags may use these as indicators of their respectability, which despite differences in level demonstrates their operations as distinct from poor. Establishments obtaining 3 scores leading to "gold/exemplary" level facilities provide both indication of best practice and also act as inspiration for other establishments to raise their standards. It is possible that an inspector may wish to assign a 3 score/3 star/gold level rating to a single exemplary aspect or facility of an establishment, rather than the entire establishment.

CONCLUSIONS
Animal welfare as well as human health and safety considerations conjoin across a diversity of animal establishments. Overseeing these establishments, however regulated, requires onsite inspection by suitably qualified, impartial, and competent personnel. Standardization of modern inspection methodology provides a "safety net" level for management protocols aimed at delivering reasonable protections both for animals and people. Mandatory minimum standards of husbandry and inspection may be augmented by incentivization of establishments to voluntarily further raise operating conditions to achieve recognized distinctions, which also offer elevated public assurance. We believe that this is the first impartial resource that meets the "three-asset" target for providing guidance regarding animal husbandry for diverse establishments, inspection protocols, and the provision of a relevant assessment tool to aid the guidance.

AUTHOR CONTRIBUTIONS
All authors contributed equally to the concept and design of the paper. CW prepared the first draft. CW, MJ, PA, AP, and CS provided additional research and writing input to the final manuscript.

FUNDING
The Animal Protection Agency contributed financially to the literature search and review by CW and CS, whilst having no design, research, data collection, analysis, interpretation, writing, decision-making, or other directional role in this report. APPENDIX Appendix 1 | Template: overall performance rating chart for animal establishment.