[yorkieusa]

I can't tell you that's what it is. I can only guess. If you suddenly change their food, they will nearly always get sick. Most of us change food the way you did, just adding a little more of the new food over a period of time. If your little one is very small, you want to be really careful that he doesn't become dehydrated. You did say he was drinking though, so he should be ok. How you are going to change him over to the new food without him getting sick, I don't know. Like I said, that is how I change over to a new food. Have you asked the dr?