According to the ADA, service animals can only be dogs and have to be trained to perform specific tasks in relation to the special needs of their owner. Ex. A dog trained to sense a coming seizure of its owner or a dog trained to sense and alert it's diabetic owner of low blood sugar. Anything else is a pet. Like it or not, it is what it is.
Here is a good article regarding esa animals. The guy has no right to claim that squirrel is a service animal. He is part of the problem.
http://www.jems.com/articles/print/v...t-animals.html