Hachiko can refer to both the dog in a real story or the dog in a fictional story and movie. The fictional one is based on the real one, and Hachiko has become a symbol of constancy and loyalty. Every day, Hachiko would go to the train station to meet his owner. His loyalty remained even after his owner died. Hachiko would continue to go to the station to wait for him.
I think that it is Brutus's guilty soul and that it has taken over his dreams. I think this because<span>it say Brutus's evil spirit which lead me to beileve guilty soul.</span>