I'm confused as to whether there is an actual difference in the 1 year vs.3 year vaccine. Different places on the net say conflicting things. The one thing they all do agree on is that you do need the initial vaccine and then the 1 year follow up. The immune system takes time to develop sufficient immunity.
Rabies vaccinations - learn why are some good for 1 year and some good for 3 years for rabies vaccinations