Please be very careful with any additional vaccines going forward. You might want to read Brandi's story:
http://www.yorkietalk.com/forums/mem...y75s-pain.html
Vaccine reactions get worse and worse so it is important that you talk to your vet about the option of a titer. No one gave Brandi's owner that option. As for rabies - I think there is advocacy work going on in your state to promote a medical exemption. You can contact the Rabies Challenge fund for info.
Duration of Immunity Study for Rabies Vaccine - Rabies Challenge Fund