Three Year Vaccine
Just so everyone is clear, the 3 year rabies vaccine is actually the exact same as the 1 year vx. Through research vets realized that the vaccine actually stayed in the system working for longer, therefore they extended the time it is good for.
Titers
My vet does a test to determine if the antibodies are still present. If they are, there is no need to give the shots. Rabies is still required by law, but neither of mine had to have any other this year. They always test before they give any of these shots or the bordatella.