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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.
Here are some tips for home-treatment: 1  For vomiting, withhold food but not water for 12 to 24 hours, and then gradually reintroduce your dogâs regular diet.  For diarrhea, do not withhold food or water, but switch to a bland, easily digested diet for a couple of days.