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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.
Causes of diarrhea in dogs. Since there are numerous causes of diarrhea in dogs it is always a good idea to have your dog examined by a veterinarian to rule out more serious causes. Here is a brief list of causes of diarrhea. 1  Parvovirus Infection.2  Usually vomiting and diarrhea accompanied by a fever typically in young dogs. 3  An antigen test is usually used to diagnose this infection. 4  Parasites in dogs. 5  Including roundworms, hookworms, whipworms, coccidia, Giardia, tapeworms.ere is a brief list of causes of diarrhea. 1  Parvovirus Infection. 2  Usually vomiting and diarrhea accompanied by a fever typically in young dogs. 3  An antigen test is usually used to diagnose this infection. 4  Parasites in dogs. 5  Including roundworms, hookworms, whipworms, coccidia, Giardia, tapeworms.