Bullet Head (also known as Unchained) is a 2017 American-Bulgarian crime thriller film written and directed by Paul Solet and starring Adrien Brody, Antonio Banderas, and John Malkovich.

Despite growing large and taking on multiple canine opponents within single matches, the dog has become injured, and Blue instructs the handler to put him down.

Stacy contacts another driver, but they won't be picked up until the heat dies down the next day.

While Stacy and Walker discuss cracking a stolen safe, Gage is in opiate withdrawal and desperate to shoot up.

As they wait for morning, Stacy thinks of his girlfriend Grace who had left him years before, but asked him to join her.

Walker tells Stacy a story from when he was younger; a failed burglary led him to stealing a number of fish from a pet store as a gift for his daughter.

A police dog handler arrives on the scene to search the vacant building, followed by squad car with another two officers.

While searching the office, Stacy and Walker find a back room full of dog-fighting winnings, at least double what they estimate is in their safe.

The mastiff eventually figures out his hiding spot, and furiously attacks the piano until it collapses.

Stacy falls from a ledge and escapes through water, but sustains some gunshot injuries and is forced to ditch the bag of money.

Blue aims his gun at the dog, but in a moment of egotism, lets his guard down, and the mastiff attacks.

A final scene shows Grace watching children play near an ocean, when Stacy arrives with a young puppy in tow.