Thanks for all the advice. He really seems normal and happy besides that, he does not act sick at all. When I had to change the food I did mix it in with the old. I bought some Pedigree Puppychow today, and he really seems to love that. I also got some stuff called Pet Pectillin Diarhea medication. I just started giving him some of that mixed in cottage cheese today, so I'm hoping he'll be improving.