The usual cycle of parvovirus infection is 7 to 10 days. Under normal circumstances, 3 to 6 days is the most serious period, and more detailed care must be taken. Symptoms such as wilting, not eating, and vomiting usually occur within 1 to 2 days. High fever, listlessness and other intestinal symptoms usually appear within 2 to 3 days. Severe dehydration usually occurs within 3 to 5 days, along with digestive symptoms such as diarrhea.

If the dog persists on the 5th or 6th day, and symptoms such as bleeding and vomiting gradually disappear, and white blood cells begin to rise, the dog will basically start to improve by the seventh day. In 5 to 7 days, the mental state will slowly recover and the white blood cells will gradually return to their original normal number. People usually start eating after 7 to 10 days and gradually return to their original state.