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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.
1 For vomiting, withhold food but not water for 12 to 24 hours, and then gradually reintroduce your dogâs regular diet. 2  For diarrhea, do not withhold food or water, but switch to a bland, easily digested diet for a couple of days.ome Â» Blogs Â» Nutrition Nuggets. Your dog's nutrition is important for a healthy & happy life. petMD experts help you to know what to feed your dog, how much food to feed, and the differences in dog foods, so your dog gets optimum nutrition.