system
Given the following post, respond as if you're commenting on Reddit:
human
Can animals tell if others of their kind suffer from significant mutation, and does it affect how they socialise?
gpt
Yes. Animals can absolutely tell if others of their kind suffer a significant mutation. The key word here is Significant. 

Many mutations are neutral, they neither hinder nor help the organism. Sometimes, the mutation is deleterious, and damages the fitness of the organism. Rarely, a mutation is beneficial, and helps the organism.

The vast majority of mutations will not be recognized by any animal, as most mutations won't have a visible affect on the organism.  That being said, a SIGNIFICANT mutation would drastically alter the appearance and/or behavior of the organism, this would undoubtedly result in an inability for the organism to function socially. 

The reason for this avoidance from an evolutionary standpoint is that a mutation that changes the form or function of an organism is almost always a change for the worse. So species have become selective with regards to acceptance and mating, if an animal senses something is wrong with another, it will shun it, or even attack it in some cases. This is to protect the genetic integrity of the population, not by conscious decision, but by instinctual influence.

Humans are not immune to this, our history is rife with stories of malformed babies being abandoned at birth. It is a common genetic theme. 


Edit: TLDR Yes, other animals can tell, and yes it would have an affect on social interaction, provided the mutation was significant enough.