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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.
Common medication prescribed to stop canine diarrhea include: 1  Metronidazole, which is an antibiotic treatment, suitable if the diarrhea is caused by an infection. 2  Kaolin or pectin is a medication that can be administered if the dog has ingested garbage or a toxic ingredient.robiotic Powder. Probiotic powder may be added to the dogâs food to relieve diarrhea. The powder may be diluted in water or simply mixed with the dogâs food. Alternatively, digestive enzymes can be used.