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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.
If your dog's digestive problems continue for more than 24-48 hours, and/or intensify, he or she needs prompt veterinary attention. In dogs with ongoing or severe diarrhea, vomiting, loss of appetite, or thirst, the risk of dehydration and infection increases.f your dog's digestive problems continue for more than 24-48 hours, and/or intensify, he or she needs prompt veterinary attention. In dogs with ongoing or severe diarrhea, vomiting, loss of appetite, or thirst, the risk of dehydration and infection increases.