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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.
Causes and Prevention of Diarrhea in Dogs. Causes & Prevention of Diarrhea in Dogs: Veterinarian reviewed information that explains the causes of dog Diarrhea, including how loose stool may be prevented. Read More Diagnosing Dehydration in Dogs.