Cerberus

In Greek mythology, Cerberus was the monstrous, three-headed dog that guarded the gates to the Underworld, preventing the dead from leaving. Cerberus features in many ancient legends, including the tale of the lovers, Cupid and Psyche. In the story, Psyche was sent on a quest to the Underworld, where she had to use cakes baked with honey to distract the dreaded hound. This wood engraving by Edward Burne-Jones was designed to illustrate a lavish publication of William Morris's The Earthly Paradise. The proofs were made at the Chiswick Press in the 1880s, but the project was abandoned. Burne-Jones shows Psyche throwing cakes at the drooling figure of Cerberus.

They were looking straight into the eyes of a monstrous dog, a dog which 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.

Harry Potter and the Philosopher's Stone