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"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."
— Description of Fluffy, a three-headed dog[src]

A three-headed dog,[4] also known as a Cerberus,[3] was a very rare magical beast.[2][4] It is unknown if, like the Runespoor, each head served a different purpose. Their great weakness was the inability to resist falling asleep to the sound of music.[4]


"What do they think they're doing, keeping a thing like that locked up in a school? If any dog needs exercise, that one does."
Ron Weasley's shock after having encountered Fluffy[src]

Rubeus Hagrid once owned a three-headed dog named Fluffy, which he obtained from a Greek man he met at a pub. Fluffy served as one of the obstacles to the Philosopher's Stone in 1992.[2][4] In October 1991, Harry Potter, Hermione Granger, Ron Weasley and Neville Longbottom inadvertently stumbled upon Fluffy after night hours at Hogwarts, when they were trying to hide from Argus Filch.[1] Later in June 1992, Harry managed to put Fluffy to sleep by playing the flute, so he, Ron and Hermione could enter the Underground Chambers.[4]

During the Calamity in the 2010s and 2020s, three-headed dog Foundables starting appeared throughout the wizarding world. Volunteers of the Statute of Secrecy Task Force were sent to deal with these Foundables to be freed and return to their rightful places of belonging.[3]

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