Versican Plus DHPPi (canine distemper virus, canine adenovirus, canine parvovirus, canine parainfluenza virus) is a veterinary vaccine used to protect dogs against canine distemper, canine adenovirus (hepatitis), canine parvovirus, and canine parainfluenza virus. The "DHPPi" in the name refers to these four diseases: Distemper, Hepatitis (caused by adenovirus), Parvovirus, and Parainfluenza.