Today we were at the creek, and on our way out my son said, "look, a cat!" I looked, and it was a black and white spotted rabbit instead. His dad got out and caught it. It's clearly not wild, he's very tame. We asked all the houses nearby if he belonged to them, and they said no, so we want to keep him. I don't know much about keeping rabbits and any advice would be helpful. I have it in a small kennel with some water and celery. What do I need to do for him?