How do you know parvovirus is cured?

After parvovirus infection a dog usually shows frequent vomiting, poor appetite, lethargy, and bloody stool. If vomiting and diarrhea ease and appetite returns, the dog is improving. The owner can do a blood test to confirm white and red cells are back to normal. Parvo severely damages the gut lining, so after cure keep a nutritious, digestible diet.