Hi Karen, if it has been less than 3 years since he had a tetanus vaccination you could probably wait. On the rabies vaccine I think it is recommended  to prevent humans from getting the disease from the horse. It is a reportable disease and national figures show that quite rare in horses. Look at figures in your state for  others like EEE WEE etc. I sure dont want to overwhelm my animals with vaccinations they probably dont need if the chances are really small of accquiring the disease.
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- Frances C.
December 2017, Washington & California
Case history: https://ecir.groups.io/g/CaseHistory/files/Frances%20and%20Phoenix
Phoenix's Photo Album: https://ecir.groups.io/g/CaseHistory/album?id=12382