The only AHT distinguishing characteristics from its coated Rat Terrier foundation stock is its hairlessness. They created a registry known as the National Rat Terrier Registry (NRTR). Breed loyalists maintained the bloodline, leading to the modern Rat Terrier. Another terrier which often is confused with the Rat Terrier was Roosevelt's dog named Jack. It is sometimes mistaken for a Rat Terrier or a Jack Russell Terrier. The NRTA continues to classify the Teddy Roosevelt Terrier as the Type B Rat Terrier. The Rat Terrier comes in a variety of coat colors. They track all three sizes of Rat Terrier&colon; the Toy/Tot, Mini, and Standard. Modern examples include the Jack Russell Terrier, the Rat Terrier and the Patterdale Terrier. It is the largest private Rat Terrier organization with thousands of registered dogs and puppies. Feist dogs, as a breed type, are what now are called the Rat Terrier. AKC accepted the Rat Terrier into the Terrier Group in June 2012. Other related breeds include the Jack Russell Terrier, the Rat Terrier, and the Tenterfield Terrier. The National Rat Terrier Association (NRTA) is an American breed-specific registry for Rat Terriers.