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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.
Signs of diarrhea in dogs. It is important to understand that diarrhea in dogs can take several forms. Stools can range from abnormally soft to watery. Other clinical signs may be present such as straining while defecating, gas, abnormal odor, or blood and mucous in the stool.