Pluto was a large demon hound that terrorizes the town of Houndsworth until Sebastian tamed him and brought him to the Phantomhive estate. He was able to breathe fire, walked through barriers and shape-shifted into a human. As a human, he retained his dog-like behavior. Although Sebastian hates dogs, Pluto took a liking to him and only listened to Sebastian's orders. When Ash used him to set fire to the estate and burn London, Ciel ordered his staff to kill Pluto.
