Unleashed

Jet Li stars as Danny the Dog, a killer who has been trained since childhood in the art of death. He belongs to a London gangster, who keeps him collared, except when there's some blood work necessary. One day, the gangster meets his end, leaving Danny at a loose end. When he's not a killing machine, he is still a child. He ends up meeting a blind pianist, who takes him in, but eventually Danny's past catches up with him, putting his new family in danger.