I'm not sure what it is. I don't like anthros, but yet I kind of have one in my icon. I don't mind the anime girls with cat ears. But once you actually start giving them animal attributes, like a wagging tail or sticking their tongue out to pant I get super uncomfortable.
I can't be more helpful. ^ ^; I know I'm being vague. Maybe just stick a warning in the hiders for me so I don't click it or something.