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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.
The outlook for dogs with diarrhea is usually good to excellent, as long as the condition is treated in a timely manner. The most common causes of diarrhea â dietary indiscretion and internal parasites â are not difficult to treat successfully.