My dog, Erik, is a large, Golden Retriever. Erik has had a problem with diarrhea, and we've tried everything, but nothing seems to work. We were desperate, because a dog this size can really make a horrible mess around the house, since we work and no one is home with Erik during the day to let him out, and he has numerous accidents. My new vet recommended a prescription, very high quality and, very expensive dog food. Because of Erik's size and the amount of food he eats, this option would be a very costly one for me. My sister in South Carolina recommended Vet Select Diar-eze Formula. Her vet recommended it for her dog. He said it improves the quality of any off the shelf supermarket food. I've been giving it to Erik ever since and it has completely solved Erik's problem. And it's much cheaper than the high quality food.