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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.
Check for dehydration. Diarrhea is basically feces that contain a large amount of fluid. If the dog passes a lot of diarrhea and doesn't replace that fluid, he will become dehydrated. Dehydration reduces the blood supply to organs such as the liver or kidneys, which can potentially cause damage.1  To test for dehydration, lift the dog's scruff away from the shoulder blades and then let it go.. Put the dog on a 12 to 24-hour fast. The presence of food in the gut causes contractions of the bowel wall to push food along. But if the dog has diarrhea, these contractions can be over-enthusiastic and push food through too quickly in the form of diarrhea.