Will Falconer, DVM Moderator
Hi Suzanne,
There's a very official titer test (measure of antibodies against a disease) for rabies. I advise that if you see a positive test at any point, you can know your animal made an immune response. And that immunity is likely life long, even if the titer falls later in life.
Now, will the regulatory officialdom wake up and accept that evidence in lieu of further vaccinations? Not anywhere that I'm aware of to date. Hence, my recommendation to clients to "follow the intent" of the rabies law (i.e. get immunity), but "not the letter" of the law, which results in unnecessary damage to health without benefit to the immunity.