My state has FINALLY changed the law, and recognizes the rabies vaccine for 3 years, so I have gone back to that, and left the Purevax.

There was a spate of fibrosarcoma cases back in the '90's and none since. My vet thinks there must have been a bad batch of the vaccine. This was never an issue in other countries, only here in the USA.

So all mine are now on the regular vaccine, and it is good for 3 years.