My poor Jack Russell has been sick with D since Christmas. Since he was still eating and not losing weight we waited, and waited and tried new foods in various forms. Poor thing would cry in pain and had no outward injuries. Turns out he has IBS. We spent a small fortune on testing and the vet prescribed a very high fiber dog food. It worked! He's fine now. I wish I had D instead of C, maybe I'll ask the vet's advice. I'm now a believer in diet and IBS link. Guess I'll start that food diary.