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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.
They do state that Parvo can kill a dog within two days, and thatâs probably already scary enough, but the sad fact is that this virus, especially the latest 2c strain, can claim a dogâs life within as little as five hours after the first bout of diarrhea.hey do state that Parvo can kill a dog within two days, and thatâs probably already scary enough, but the sad fact is that this virus, especially the latest 2c strain, can claim a dogâs life within as little as five hours after the first bout of diarrhea.