Nothing in particular. Just EVERYONE asks me what she is when I take her out and when I say "Chihuahua" they give me a weird/confused look. The only thing temperament wise that confuses me is that she has a pretty high prey drive! She LOVES to Chase small animals and her hair often stands up on her back and she stares at the animal with a real intense stare. It also takes a lot of self control for her not to chase my cat.
What's weird is she doesn't react to all animals like that though lol.