Modified Live Virus, low passage, high titer vaccine provides protection against all known strains of parvovirus. Contains 8-65 times more vaccine antigen than other brands. Overrides moderate to high antibody levels such as those found in puppies having maternal antibodies or in dogs from pre-existing vaccination. Can be used as a booster for a pre-existing vaccination. Inject 1mL subcutaneously or intramuscularly into healthy dogs at 42 days of age, revaccinate every 14-21 days until dog is 18 weeks old. Dogs over 18 weeks of age should receive a single dose. Revaccinate annually. For veterinary use only.