Sounds like a Furry.
Yup! He is:
Matthew has never dated and has no interest in marriage or children. "I have good friends and I substitute friendship for anything closer than that," he said. He also belongs to a group called "furries" – people who dress like animals and meet at clubs around the world. "I have a group of fans, people who perform as mascots – they are a nerdy group like trekkies and like dog play," he said.