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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.
A dog that is lethargic, bloated, passing blood, vomiting frequently, showing signs of abdominal pain, has a fever and also has diarrhea should also see a veterinarian. The primary goal of treating dogs with diarrhea is to identify and correct whatever is causing the condition.