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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.
Symptoms of Diarrhea in Dogs. Effects of Diarrhea â From the Dogâs Point of View. Dogs with diarrhea will have a variety of symptoms, depending upon the underlying cause of their condition and whether the disorder is acute (sudden in onset and short in duration) or chronic (slow in onset and lasting for a long time).