I haven't read through every post, so forgive if this is just a repeat of what is above.
I do not know of a law that prohibits one from vaccinating their own horse w rabbies vaccine. A given state (such as NM and several others) might restrict the sale of the vaccine to vets only, though.
I do not know about all states, but in many western states public notice is given for rabbies vaccination for horses per county only during a verified outbreak (I don't know if it is "suggested" or "required"). An outbreak can consist of a single verified case, including (and ordinarily is) wild animals.
So, if there is an outbreak and you do personally administer it, you will have protected your horses from the disease, but not yourself from the law ( if there should be any question), as you will have no certification, and you will have no traceability (that will hold up) in the event the vaccine causes problems. Personally, if it weren't restricted here, I would just administer it myself.
North Carolina General Statutes 130A-191 -Possession and distribution of rabies vaccine
It shall be unlawful for persons other than licensed veterinarians, certified rabies vaccinators and persons engaged in the distribution of rabies vaccine to possess rabies vaccine. Persons engaged in the distribution of vaccines may distribute, sell and offer to sell rabies vaccine only to licensed veterinarians and certified rabies vaccinators.
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