Cerberus was a three-headed dog that guarded the entrance of the to the Underworld and find Hades to ask for his permission to take Cerberus to the surface. They spend alternate days together in Hades and in the Heavens. If you are seeking and inseparable bond with your dog, name him Castor or. In Greek mythology, Cerberus often called the "hound of Hades ", is the monstrous multi-headed In art Cerberus is most commonly depicted with two dog heads (visible), never more than three, but occasionally with only one. BC, perhaps took its name from the association of its site with Heracles' Cerberian exploit. Descriptions · The Twelfth Labour of Heracles · Principal sources · Iconography.