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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 in dogs and cats is loose stool caused by excess water in the feces. Loose stool may be accompanied by increased frequency or increased urgency. Normally, adult pets defecate once a day if they are fed once a day, and twice a day if they are fed twice a day.