I think Jaime already covered everything about the housetraining that I was going to say so i can't really help with that. About the food thing though, do not switch him to adult food right away! There is a food for dogs of his size called 'large breed puppy' or something like that. That's usuallu what people feed their pups that are going to grow up to be large dogs I hope that made sense, I'm not very good at explaining things over the computer.