I've always gotten the longer-lasting ones for my cats.. then last summer my Sydney did develop a fibrosarcoma. Fortunately a surgical specialist was able to remove it completely.
But after that happened, mine get the one-year kind. (I'm not even sure about getting them rabies shots at all any more, after Sydney's tumor, since they are strictly inside cats.)
I meant," said Ipslore bitterly, "what is there in this world that truly makes living worthwhile?"
Death thought about it.
"Cats," he said eventually. "Cats are nice."
-- Terry Pratchett, Sourcery