Dogs will have obvious symptoms of diarrhea in the early stage of parvovirus. Later, they will lose their appetite, vomit and diarrhea, and lose energy. In severe cases, they will have blood in their stools and difficulty breathing. Without treatment, they will cause internal organ damage. Exhaustion will lead to death in a short time. Parvovirus in dogs is a high-risk disease, mostly due to infection and contagion. The onset of disease occurs quickly after the disease, and if the owner does not treat the dog in time, the dog will die within a short period of time.