Will Falconer, DVM Moderator
Hey Stephen,
I'd be willing to bet this guy has a titer to rabies from previous vaccination. Titer first and decide from there. If positive at any level, it indicates he's immune.
If he's healthy and young, a blood test in general is likely to come out very normal. Doesn't hurt to check as they'll need blood for the titer.
I don't give rabies vaccine. And the law is not based on immunology, so I'd not ask too many questions on that. Better to learn what you need to know (my dog is immune!) and go from there. Most of my clients, once they've learned of immunity, fly under the radar. Lots of useful comments on this post about how to do that. Best of luck with your varmint repeller!