Pluto

Pluto, also known as the Demon Dog, is a large dog that terrorizes the town of Houndsworth until Sebastian tames him. Afterward, he lives at the Phantomhive Estate. He can breathe fire, walk through barriers and shape-shift into a human. As a human, he retains dog-like qualities. Although Sebastian hates dogs, Pluto has taken a liking to him and gets jealous when he receives less attention than a cat. He only listens to Sebastian's orders. Finnian is in charge of walking him, as he is the only one strong enough to…