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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.
What Are the General Symptoms of Diarrhea? Loose or liquid, frequent stools are the most common symptoms of diarrhea in dogs. Other signs include flatulence, blood or mucus in stool, changes in volume of stool and straining to defecate.