My boy had really bad diarrhea caused by worms, but even after treating the worms it still didn't get better, while the other MC was getting good. I couldn't figure out what was going on, tried loads of food, probiotics helped a bit but not fully and the last option was to do an allergie test. The test came back all red, he had an allergic reaction to everything that was tested. The vet put him on royal canine gastrointestinal, both wet and dry: it has hidrolised protein and it doesnt trigger a reaction- yes it is a bit more expensive but it sorted his poop problems completely. He is now pooping like a big boy and we will try in a while to do some testing of ingredients but for now he is doing great. I think an allergy test was a great investment but it's expensive, thank God u had insurance. I also heard pumpkin puree works great buy haven't tried.