Harry Potter and the Sorcerer's Stone (Harry Potter, #1)

by J.K. Rowling

“He thinks this door is locked,” Harry whispered. “I think we’ll be okay — get off, Neville!” For Neville had been tugging on the sleeve of Harry’s bathrobe for the last minute. “What?” Harry turned around — and saw, quite clearly, what. For a moment, he was sure he’d walked into a nightmare — this was too much, on top of everything that had happened so far. They weren’t in a room, as he had supposed. They were in a corridor. The forbidden corridor on the third floor. And now they knew why it was forbidden. They were looking straight into the eyes of a monstrous dog, a dog that filled the whole space between ceiling and floor. It had three heads. Three pairs of rolling, mad eyes; three noses, twitching and quivering in their direction; three drooling mouths, saliva hanging in slippery ropes from yellowish fangs. It was standing quite still, all six eyes staring at them, and Harry knew that the only reason they weren’t already dead was that their sudden appearance had taken it by surprise, but it was quickly getting over that, there was no mistaking what those thunderous growls meant.