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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.
Diarrhea in dogs, though common, can sometimes be a sign of something more serious. Find out the best way to take care of a dog with diarrhea on petMD.