[theBCnut]

Leave him on the puppy chow(oh that hurts me to say that) for a couple weeks, until he is used to living with you. All this changing around is going to give him diarrhea. It’s OK if he doesn’t eat as much as normal for a couple days. You can mix a spoonful or two into his old food, but any more than that and you’ll end up with a sick puppy.