Question re rabies vaccine

[Rosenfeldt, Diane]

Yesterday we were at the vet with our Missy, and were told she's due for a rabies shot.  I know it's "the law" in these parts, but I wanted to wait until I had refreshed my mind on which way to go.     To the best of my recollection, the 3-year shot is considered (by everybody but the vets ;-)) to be as effective as 3 one-year shots, is that correct?  What if my vets don't offer the 3-year shot?  They're good vets and I don't want to switch; should I take her to another vet that does the 3-year protocol, just for the shot?  Does the 3-year generally cost more than the 1-year?   She's a completely indoors cat, is approximately 13 years old, is on methimazole for her thyroid and diazepam for high-strungness and appetite, and has the beginnings of old-kitty stuff happening -- a very slight possible heart murmur, possible incipient kidney issues.  Five years ago, she survived a round of liver values through the roof, brought on most likely by a still-unknown toxin in our house.  We just had bloodwork done to check the methimazole dosage and are waiting for a call on that.   Thanks for any pointers!   Diane R. This electronic mail transmission and any attachments are confidential and may be privileged. They should be read or retained only by the intended recipient. If you have received this transmission in error, please notify the sender immediately and delete the transmission from your system. In addition, in order to comply with Treasury Circular 230, we are required to inform you that unless we have specifically stated to the contrary in writing, any advice we provide in this email or any attachment concerning federal tax issues or submissions is not intended or written to be used, and cannot be used, to avoid federal tax penalties.