Pluto is the devil dog currently taking a home inside the Phantomhive Mansion.
His nickname is 'Plu Plu' or 'Puru Puru'. Ciel Phantomhive brings him home on a request from Angela when she begs him to take Pluto because she could not take care of him, much to Sebastian Michaelis' dismay (due to his serious dislike of dogs), although despite this, but actually like Sebastian because he showed him discipline and no fear which made him loyal to him. He does not speak and makes animalistic sounds, like whines and growls, along with typical dog behavior. Because he often changes to his devil dog form, he is usually naked, although sometimes his is seen wearing clothing such as a butler's uniform like Sebastian's. In his devil dog form, he seems to be very large, overshadowing even Sebastian. On average his devil dog form maybe up to a story in height.
His favorite food is Innuko dog treats.
However, it is apparent he can be controlled by angels from the collar he wears.
As seen in the climax of the Black Butler anime when he goes beserk from Angela and Ash's control and burns all of London. Having no way to save him in time, Bart, Finie, and Mey Rin kill him.
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