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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.
Follow On: Diarrhea is a frequent medical concern for dogs and dog owners.If your dog gets diarrhea often, immodium may be a viable treatment option. While canine diarrhea may be a sign of a significant underlying health issue, it may also occur due to basic indigestion or other common problems.