Intestinal Viral Infection (Rotavirus) in Dogs

Rotavirus Infections in Dogs

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.

Symptoms and Types

The primary symptom of a rotavirus infection is mild to moderate watery diarrhea. In severe cases, dogs may die from dehydration, extreme weight loss, and/or an unwillingness to eat. Dogs may also exhibit fatigue or lethargy.


The rotavirus is typically transmitted through contact with contaminated fecal matter. Dogs with underdeveloped or weak immune systems and those living in overly stressed environments are most at risk for the infection.


In dogs, your doctor will likely try to rule out other conditions before diagnosing rotavirus. Some causes for inflammation of the intestine may include parvovirus (a rash disease), coronavirus (a virus affecting the intestines), astrovirus (causes diarrhea), herpesvirus, distemper virus, and canine reovirus (also called kennel cough).

Lab tests to detect the virus may include laboratory examination of tissue samples, or microscopic exploration of feces. One such test is ELISA (or enzyme-linked immunosorbent assay), a biochemical technique. Your veterinarian may also be able to identify the virus using a technique called virus isolation.

To formally diagnose rotavirus, a veterinarian will examine the intestinal villi (the small hairs lining the intestine) and other cells within the intestinal wall, using special instruments to detect the rotavirus and antibodies the virus may have produced.

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