I’m in northwestern North Carolina, so the threat of contact with rabid animals is little different. Immunity is immunity, hitting them with more vaccine than necessary is not necessarily helpful, especially with older, weakened or sickly dogs. As I mentioned, I’ve paid for blood titer to establish that there is no need to vaccinate in the past. It can take a toll, on elderly dogs in particular.
Maybe there are differing types of rabies vaccine? It’s every three years here, after first vaccination at eight weeks and a booster about three months later.
The same vaccine is administered, according to Dr. Ron Schultz — whether labeled for one year or three. Pet parent “beware”.