Hi Melanie-
That is very concerning. Have you taken the dog to a vet for a fecal or blood test. Does he have intermittent diarrhea, or all the time? First of all you need to find out if he has a health condition. I went through this with my pups, thinking it was the food, but it was actually parasites found in a fecal test.
Now, if you have ruled out those issues, then you need to figure out what ingredient or ingredients that your dog has an intolerance to. They do not necessarily have an intolerance to a food. They have an intolerance to something in the food. Try a different food with totally different ingredients than the ones you have already fed. Have all the foods you have fed so far been chicken based? If yes, try a different protein and binder on the next bag. A limited ingredient food might be the best choice to eliminate what the issue is. Keep a list of the foods and ingredients you’ve tried so far to help you rule out ingredients. I wish you luck!
