The Doctor Who K9 Keychain shows off a convenient keychain / animal companion! I knew the 4th Doctor was on to something with a robotic dog. The dog probably walks himself, gets his own food, and does his own taxes. His own taxes, people! The diecast metal Doctor Who K9 Keychain doesn't do nearly all of that, but he will make sure that your keys are nice and safe from the likes of Daleks and Cybermen. At 2 inches wide, the Doctor Who K9 Keychain is perfect for the Tom Baker Dr. Who fans!