I don't understand. You said he doesn'tt accept pets then you infer he does again which is it.

A few things about service animals:

A service animal is NOT a pet. They are a working animal.

Not any animal can be a service animal. They have to have been raised by a certified breeder/foster; go through intense training, be stringently tested, then certified.

The recipient of a service animal ALSO goes through intense training and stringent testing before they themselves are certified to own one

After a recipient has been certified he/she goes through a rigorous screening process to be matched with a suitable service animal - you do NOT get to choose the animal

Following placement of an animal, one must adhere to a strict code of conduct and care of the animal AND agree to be checked/followed up on

Finally one does not simply get a service animal. They must be recommended by their doctor or care provider and be certified that such an animal is NECESSARY to function in their daily living.

You and this cat clearly do not meet these criteria.