The people that work in the pet food stores are almost always more helpful than the darn vet! My dogs poop was not right for a while, we had her tested for parasites and all that other stuff and she was fine..trial and error through different foods but it was the pet store worker that suggested changing the protein (we went from chicken to beef in the end) and wouldnt you know that did it? She is fine now! The vet never once mentioned protein as a possible cause for loose stool. Anyone that is having a hard time with food, try the pet food store, those folks are really knowledgeable!