Dogs will begin to recover after a week of parvovirus disease if they do not die. The first three days are the initial stage of the disease, with vomiting, diarrhea, not eating or drinking, and lack of energy. On the fourth day, the condition will worsen and even cause death. Blood in the stool and dehydration will begin to alleviate a little on the sixth day and begin to improve on the seventh day. Although parvovirus is a relatively common virus, it can be cured, so once it is discovered, treat it promptly to avoid delaying the condition.