So I'm sure there's probably a thread on this topic somewhere, but I can't find it. Beauregard went to the vet a few days ago with diarrhea and vomiting and we were told he has gastroenteritis, and since then we've been feeding him chicken and rice with a bit of yogurt and giving him his medication afterwards, and after giving it a few days we added his Wellness super5mix puppy food to it and he's back to diarrhea... He has another vet appointment in a week and I'm concerned about his weight being on chicken and rice for two weeks, he's 9 weeks old and 5 pounds or so, and I'm also wondering whether the wellness is a bad fit? He was itching on the breeder's Eukanuba, and since being on chicken and rice (and wellness) the itching is almost gone, how do I determine whether he has a food allergy? I know, it's a lot of questions but I've never had a dog with a sensitive stomach... Thanks in advance for all the input.