My 11 y/o cocker has severe diarrhea have been to vet numerous times, put her on probiotics and Metronidazole 500 mg and is on Royal Canine Gastro dry food. She eats only her dog food. Have tried chicken and rice, made it worse. Does anyone think it might be the food it has grains in it. Help I am desperate put a call in my vet waiting for a call back. It seems to happen between 1 and 2 hours after feeding.