I would have to say all animal ears are safe from me in terms of nibble. It never occurs to me to put their ears in my mouth. Why would one do such a thing? What do you find so compelling about their ears that you must put them in your mouth instead of just petting them? How did such a thing ever start? Were you just sitting around with nothing else to nibble on? Was it a question of what their ears tasted like? Was it a drunken bet?
When making any list concerning things that go in a mouth and things that do not-animal ears are always, without exception, in my things that do not list.