Quote Originally Posted by mainbutter View Post
i have not heard of allergies in animals other than humans.

This is primarily because it's not researched, or for that matter much cared about among those with the capabilities to research it.
Actually, I'm pretty sure it HAS been researched, and pretty commonly accepted that animals can have allergic reactions. Dogs and rats are the main ones off the top of my head, but if you google it I'm sure you could find plenty of information.