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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.
Diarrhea; Treating Acute Diarrhea And Chronic Diarrhea in Dogs. Similar Products. Dogs commonly develop acute diarrhea. Because we are all concerned about our dog's welfare, we often run them in to see the veterinarian at the first signs of diarrhea. This is usually not necessary, and often will end up being detrimental to the dog if antibiotics are needlessly prescribed. Chronic diarrhea is less common, but is more serious and will require more effort to correct. First, lets look at acute diarrhea.