parvo Not all cases of bloody diarrhea with or without vomiting are caused by Parvovirus and many sick puppies are misdiagnosed as having 'Parvo.' The only way to know if a dog has Parvovirus is through a positive diagnostic test. In addition to the more time consuming and expensive traditional testing of the blood for titers, a newer and simpler test of the fecal matter with an enzyme-linked immunosorbent assay antigen test (ELISA) are also available through most veterinary clinics. Testing of all suspect cases of Parvo is the only way to correctly diagnose and treat this disease |