The color of a dog's small diarrhea will be darker in the early stage, more dark brown, and will turn bright red in the later stage. At this time, the condition is getting worse, and timely treatment is needed to stop the bleeding and supplement nutrition to prevent the dog from becoming weak. , unable to hold on and died. Parvovirus is a very common infectious disease in dogs, but the cure rate is relatively high, so active treatment is required after discovery.