Canine parvovirus (CPV), commonly referred to as parvo, is one of the most serious viruses that puppies, adolescent and mature dogs can contract. Why? Because this potentially fatal virus is especially difficult to kill, is able to exist for an extremely long time in the environment, and is shed in very large quantities by infected dogs. There are two slightly different strains of canine parvovirus: CPV-2a and CPV-2b. While both cause the same disease, CPV-2b is associated wi