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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.
Veterinary Q&A: Bloody diarrhea in dogs â Part 1. Originally published February 21, 2012 at 6:00 am Updated February 21, 2012 at 10:16 am. Dr. Beth Guerra, an emergency veterinarian at Animal Critical Care and Emergency Services (ACCES) hospital in Renton, answers this week's questions about bloody diarrhea. It is the first of a two-part series.