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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.
Finding a good diarrhea medicine for your pooch can be a challenge. Itâs frustrating because dogs often experience upset stomach and the like. Diarrhea, in particular, shouldnât be a surprise especially if your dog ate something questionable. How to treat it is less clear!