Many years ago, I had two cats who were sisters from the same litter: Miles and Kaylynn.
After a move to a new city, I dropped them off for their shots and warned the people at the vet’s office that Miles was protective over Kaylynn and not to have them out at the same time, or she would probably attack them for touching her sister.
When I came to pick them up, I was confronted by a very upset vet tech and the vet.
Vet: “Your cat is vicious and will need to wear a muzzle and be sedated if she is allowed back here.”
The tech held out her arm which had multiple bloody scratches.
Tech: “She attacked me and bit the vet twice!”
Me: “You mean Miles? The short hair? Was this during a shot?”
Vet: “We had already finished with her, and when we took the other one out and started to give her a shot, she growled and attacked us!”
Me: “I did tell you not to have them out at the same time because Miles is protective of her sister. If she attacked you, that was your fault.”
Tech: “That animal is evil, and I refuse to work on her again.”
Vet: “We’ve never had issues with animals from the same house out together before. There’s something wrong with your cat, and I don’t know that she’ll be allowed to return.”
Me: “That’s fine; I have no intention of bringing either of them back here when you can’t listen to simple instructions and blame the cat for something you were informed would happen.”
The vet and tech kept insisting there was something wrong with my cat, all because she was her sister’s protector. I never took either one of them back there, and I eventually found a different vet that both girls adored. None of the techs ever had a bad thing to say about either cat at the new place, probably because they did as I warned them and never tried to treat Kaylynn when Miles was outside her carrier.