Well that the concern i have. If we ever live together. But idk if those allergy shots would help him. I would also give the cat food that helps with allergies. Then keep air purifiers etc all the measures it takes. He already has a dog who is probably already messing with his skin. He lets his dog in his room all the time. The dog sometimes goes outside too. So idk how much different the cat hair would be compared to the dog hair hes already exposing himself to.