Parvo is a highly contagious viral disease that can produce a life-threatening illness. the virus attacks rapidly dividing cells in a dog’s body. There's no cure for Parvo. The “vet” gives you some medicine to give the dog. Try to feed it a little at a time to get it in their immune system. Symptoms are, lethargy, severe vomiting, loss of appetite and bloody, foul-smelling diarrhea that can lead to life-threatening dehydrationIt affects dogs and cats. Parvo is a deadly disease only some dogs or cats survive.