Will Falconer, DVM Moderator
Kelli, it's most important, for your peace of mind, to order a rabies titer test. Odds are, he's not "out of immunity" though he may be "out of date" by the arbitrary standards used in the conventional medical world bent on vaccinating.
Your vet draws the blood, sends to Kansas State lab, they run the test and send results.
Key point: immunity to virus vaccines "lasts for years if not the life of the animal." -- https://vitalanimal.com/vacc-efficacy/