fruitsalad, I find that once my dog has the runs, nothing helps, changing her food, starving her, nothing. The only thing is that stuff I told you about from the vet's, it's amazing stuff. Some dogs are more prone to the runs that some others and sadly mine is one of them. There is nothing else wrong with her, she has had tests and is a happy, playful girl, just has a sensitive tum, sadly. If your dog continues with the runs, the vet will probably do some tests if you agree, but he may just be like mine.