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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 most common cause of diarrhea in dogs&rsquo; stems from intestinal upsets. Changing a brand of food suddenly, giving an unfamiliar treat, and feeding people food can all cause intestinal upsets and diarrhea in dogs.