Yeah, it’s a scam, but I can’t help but be sympathetic towards people and their pets.
A scam is a scam. I’m somewhat sympathetic to the old guy too, but the rules are the rules. If they make an acceptation for him then they are going to have to make the same exception for anyone else who claims their pet, no matter the size, breed, type and suitability, etc. is an emotional support animal.
Let me welcome you to your new neighbor and his emotional support pit bull and your other neighbor with his emotional support elephant.