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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.
The double-stranded, wheel-shaped rotavirus causes inflammation of the intestines and in severe cases, dysfunction in the intestinal walls. It is the leading cause of diarrhea and gastrointestinal upset in dogs. And although it can be seen in dogs at any age, puppies are more prone to rotavirus infections, especially those less than 12 weeks old. Cats are also susceptible to rotavirus infections. If you would like to learn more about how this disease affects cats, please visit this page in the PetMD health library.