I have a senior dog with stomach issues due to a stomach infection. I too have tried many foods. The one I found that worked was Natural Balance sweet potato and chicken. It seems any food with meat as the first ingredient has bothered him. He had also been on metranidozole, but we found by accident that amoxicillin worked better for an antibiotic. We only found this when he had a swollen lymph node that came back showing signs of infection. Within the first few days of being on that, his stools improved. My vet said it’s not common, but also not unheard of for amoxicillin to work better in some dogs.
