Hi. No matter what your vet says, ANY animal can have a reaction to ANY medication or vaccine, just like people. There's no such thing as something NO ONE will have a rxn to-look at how many food allergies there are. Our vet and vaccination clinic also use "ferret vaccines" and they still premedicate with Benadryl and have us stick around for 45 minutes or so after the vaccinations in case they have a reaction. Sounds like your vet could use a little more ferret education... Good luck! -April [Posted in FML issue 3372]