Some cats just will not tollerate them.
I think it goes against their nature in a way cos they probably feel like they are being put into something like a straightjacket and then being forced to dance to their humans tune. Of course we know that its us that dance to their tune
Kocka was very old and wasnt bothered and maybe it gave her a sense of being safe, although the way she strutted through service stations, it semed like she was taking me for a walk.
She would tell me though when we were in Devon if she didnt want to go out for a walk and when I would get the harness she would say absolutely no