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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.
Chronic diarrhea in dogs may be due to a primary gastrointestinal disease, or can be secondary to a systemic disease. 1  Parasite infection is a common cause of chronic diarrhea in dogs that is usually easy to diagnose and treat.  Food intolerance or allergy is another common cause of chronic diarrhea in dogs.