The animal tail butt plugs work better for me if the chick is wearing the ears on top her head too. That is as furry as I can go though. They start doing noses, hands, feet or full blown suit and I'm out.

There is a hentai manga where they have genetically engineered animal girls for pets. They have the tails, ears of the animal and the brain of a domesticated pet like a dog or cat but look human otherwise. The premise of the the manga is that there are real human women who dress up like the animal girls and act like them for the sole purpose of getting fucked by dudes who find them and think they are strays. I can't remember the name though.