Canine coronavirus was discovered, almost by accident, when canine parvovirus spread world wide in the late 1970s. Most infections are subclinical causing no signs of illness. Younger dogs are more likely to develop clinical disease, with signs including vomiting, diarrhea and lethargy lasting a week to ten days. Rotavirus infections are also usually subclinical, causing mild gastroenteritis in some pups under two weeks old. Supportive treatment with electrolyte fluids is usually all that is necessary. While a coronavirus vaccine is available, we feel that its limited value and the mild clinical signs of infection do not justify its use. This is also the recommendation of national and international virologists.