This side effect is easy to discover on the Internet, but supposedly, it's rare. That's no reason why your vet shouldn't have known (or found out) about it--if WE can find out about it, it probably would have been on the circular that came with the vaccine.

Hugs to you. I'd give one to Bandit, but even rumors of an e-hug might freak him out and he's already working on getting better. So please pass my well-wishes on to him.