Dogs whining all the time in the late stage of parvovirus are caused by discomfort and pain in the body, because parvovirus can cause diarrhea and blood in the stool, so the dog will have stomach pain; another possibility is intestinal spasm, it is best to seek treatment in time Hospital examination and treatment can alleviate the dog’s pain. Dogs in the late stage of parvovirus will have more serious diarrhea, and they need to stop vomiting, diarrhea and bleeding, as well as infusion to prevent the dog from dying of dehydration.