Red

Red is a movie starring Brian Cox, Noel Fisher, and Kyle Gallner. A reclusive man sets out for justice and redemption when three troublesome teens kill his dog for no good reason.
Avery, a reclusive older man, has a best friend in his dog, Red. When three teens kill Red without reason, Avery sets out for justice and redemption, attempting to follow the letter of the law. But when the law fails him, and the boys' father clearly defines right and wrong in his own way, Avery must avenge himself by any means possible.