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Report Abuse. In general puppies should not have untreated diarrhea for more then 24 hours. For adult dogs that can be extended to three days depending upon the size of the dog. Diarrhea is a sign that something is wrong.
Foods That Cause Diarrhea in Dogs. Diarrhea in dogs is not always cause for alarm. Sometimes something as simple as a change in diet can trigger a bout of diarrhea. But some foods that are fine for people to eat do not work well in a dog's system, no matter how much your dog likes them.