She was named Ninja when we got her, but she is totally not a ninja. Not stealthy at all and, in fact, just about as much a klutz as me. As Corey said, "She reminds me more of a Beverly Hills Ninja then Shinobi." And she tripped on the curb when we took her to PetSmart to pick out toys. Twice. Both entering the store and exiting. There was no deliberation that went into calling her Zombie, though. The first time I raised my voice to tell her and a friend's dog to settle down I called her Zombie instead of Ninja by accident. We call her Z for short.