Parvovirus is an acute infectious disease for dogs and usually dies within 24 hours of getting sick. If your dog does not die and stabilizes after 48 hours of contracting parvovirus, congratulations, you have passed the dangerous period. Breeders should not feed the dogs when they are feeling better. They should fast for 24 hours and then feed them a small amount of rice porridge and soft liquid food. Dogs that have recovered should pay attention to protecting their gastrointestinal tract and keeping their bodies warm to avoid recurrence.