Ok so, hear me out - bunny is from a whole planet and comes from a species of warriors that predate Earth. It is purely coincidence that they share a lot in common with rabbits/hares on our planet right.
So I’ve always had this headcanon that he would actually be considered a predator then prey, and I think that would show up with him having some canine/ sharp teeth.
Like what if that’s how tooth even found out that he wasn’t from this world because he doesn’t talk about his past much. She’s just checking for cavities and then BAM and she’s like “wtf are you dude?????”