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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.
In cases of chronic diarrhea in dogs-. 1  Treatment of chronic diarrhea in dogs in dogs involves treating diarrhea as per the cause. 2  If the cause is a diet change, then it should be reverted. 3  Lactase deficiency should result in the elimination of milk and milk products.