Yeah our vets are mostly small animal ~ though as we border country they do some large animal too, mostly horses & goats. They are pretty clueless about chickens though the lady I usually see keeps chickens herself, she just doesn't know much about them.
My present cats are Ragdoll Xs & they hate the vet & flatten themselves in the carrier & push their not inconsiderable weight down. Last time the vet said she had to remove Marlow ~
yard by yard...

It was like reeling in a dead whale!!! Luckily my Big Boy is also very placid.