Originally Posted by Jull
What exactly is his stomach problem? has a vet done any tests to tell you exactly what the problem is?
If I know my dog has some issues with foods, I wouldn't just give him anything a trainer recommends, while they may be knowledgeable in some areas they are certainly not nutritionists, heck, even vets sometimes are not very knowledgeable in this area.
I agree , I asked my vet about dog foods and she said she was not trained in that area. If the OP dog had diarrhea for a few days and is "withering away" she should bring her dog to the vet to find out what is going on.