Alvin is a furry that got a successful fur transplant that makes him look like an animal. He had vocal surgery to make him sound young, and another to make him sound like a chipmunk. Then he had another surgery to reverse his growth, making him the size he is today. Then he had retinal surgery to make his eyes really wide and ear surgery (which just involved cutting off his ears and replacing them with a rabbit's ears [please don't ask where they came from, we really can't afford to get sued by PETA atm]). Then he had his nose removed and shot two holes in its place. For the feet he just got flaps (don't get us in trouble with PETA for that either). For the tail, he took four bunnies, wrapped their tails together to make a super tail, cut them all off their owners, and superglued them onto his butt in the style of Tessica Brown.
If I just farted on someone's childhood, I apologize.