" Cerberus,” I said promptly. “But everyone knows that.” “Do you know what it means?” I opened my mouth and closed it again. I shook my head. “It is from an ancient word, kerberos. It means ‘spotted.’” I blinked. “You’re a genuine Greek god. You’re the Lord of the Underworld. And . . . you named your dog Spot?” “Who’s a good dog?” Hades said, scratching the third head behind the ears, and making the beast’s mouth drop open in a doggy grin. “Spot is. Yes, he is. "

― Jim Butcher , Skin Game (The Dresden Files, #15)