I often wondered how/why in most recent times, my required Vet visits went from every three years to annual. HECK, I even have experienced some Vets that only offer annual rabies shot in lieu of the three year. Go figure...
And, to further add to the point made by yougetthesmiles... Check out what I found at the The American Veterinary Medical Association sight:
Q:
How often should my pet be vaccinated?
A:
Your veterinarian will tailor a vaccination schedule to suit your pet's needs. For many years, a set of annual vaccinations was considered normal and necessary for dogs and cats. Veterinarians have since learned more about diseases and pets' immune systems, and there is increasing evidence that immunity triggered by some vaccines provides protection beyond one year. The immunity triggered by other vaccines may fail to protect for a full year.
More than one successful vaccination schedule is possible. Talk with your veterinarian about what is best for your pet. So, don't be afraid to ask questions about or even refuse those shots schedules!!! http://www.avma.org/issues/vaccination/default.asp http://www.avma.org/communications/b...n_brochure.asp