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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.
This is not always an easy question to answer. How long diarrhea lasts will depend a lot on what is causing it. In most cases, diarrhea lasts one to three days.However, it is possible for diarrhea to last for several months or even longer. There are two types of diarrhea -- acute diarrhea and chronic diarrhea. Acute diarrhea is diarrhea that improves within two weeks.his is not always an easy question to answer. How long diarrhea lasts will depend a lot on what is causing it. In most cases, diarrhea lasts one to three days.