Avenging Fangs (1927)

Following a murder by a band of robbers, Dick Mansfield and the victim's dog, Sandow, travel west in pursuit of the leader, Robert Ludlow, and his confederate, Trigger Kincaid. Trigger is captured by the sheriff, who is later convinced by Robert that Dick is the actual criminal mastermind. Robert frees Trigger, but Dick also escapes and arrives with the sheriff at the gang leader's cabin. Mary Kirkham, a young woman whom Robert has jilted, identifies him as one of the murderers. Dick reveals himself as the slain man's brother and takes Mary for his bride.