I'm so sorry this all happened and I agree, the bottom line is the rottie needed a muzzle.

I've used the same vet for over 20 years, and, as far as I know, there is no policy in place for muzzles. I might ask, though, next time. There is a policy on cages for cats and small dogs. There is no way they could have separate entrances without reconstructing the front of the building. If they do take in aggressive dogs in the back it is not to my knowledge.

All this has made me think I should ask some questions!