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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.
Treating Your Dogâs Diarrhea Through Diet. 1  1. Put the dog on a 12 to 24-hour fast. 2  2. Provide fresh drinking water. 3  3. Ease your dog off his fast with bland food.  4. Try a prescription diet from the 1  vet. 5. Ration his portion sizes.  6. Transition your dog slowly back to a regular 1  diet. 7. Administer probiotics.