what brand of vaccines are they? i know the strain of parvo used in the eurican vaccine and the nobivac parvo vaccine are derived from strains originating in differant countrys. my vet seems to know nothing about these new shorter lasting vaccines and recomend that i get my dogs vaccinated for distemper, parvo, hepatitis every 3 years and lepto-2 and parainfluenza every year. he uses the nobivac brand sometimes the canigen brand of lepto2.