The Broken Law (1924)

Cowboy Burt Morgan loses all his money at poker, so sets out to find a job. On the trail his horse gets spooked and throws him, knocking him out. An Indian passing by shoots Burt's dog, then regrets it and leaves the unconscious Burt a bag of gold nuggets as payment. Two passing cowboys see this and attack and beat the Indian, stealing his treasure map. The local sheriff is told by the two cowboys that Burt has killed the Indian, but when the sheriff refuses to arrest Burt, the cowboys decide to kill him themselves.