Sorry you had to go through this Moosmom but I'm glad your cat seems to be back to normal. I agree there should be a plan in action since this could repeat itself at any given time. I think the techs should have been coached about such incidents and should know how to break fights up without using a carrier with a cat inside.
The stupidity of some people never ceases to amaze me. I just can't believe someone would actually take a dog aggressive dog to the vet's without a muzzle. I'm also surprised at the techs. If this had happened at my vet's the owner of that rottie would have been asked to take the dog out and they would have handed the lady a muzzle. As for being a rescue I don't think that kind of dog belongs in a home where it could hurt someone. And that doesn't mean I'm against rotties, I rather like them but not this kind.