Edward J. Meagher

An undercover agent tracks a gang of drug smugglers to their headquarters in Mexico, a nightclub, where he manages to get a job as a bouncer. There he meets and falls for a pretty young woman, whose father happens to be the man the agent suspects of heading the gang.

When Rin-Tin-Tin's master is found murdered, Rinty is accused of the crime.

Klondike the German Shepherd dog works with the Northwest Canadian Mounted Police to track down smugglers.

Bob and Jim Whitely are twin brothers. Bob, an army veteran who suffered shell shock in the war, escapes from a sanitarium and holds up the Express train, for which Jim is mistakenly arrested. Jim soon escapes from jail in order to find his brother. However, his task is complicated by a crooked sheriff who pins a holdup and murder on him that the sheriff himself actually committed. To make matters worse, the murder victim was Tommy Wilkins, the brother of Jim's fiancee, who now thinks that Jim killed her brother.

A soldier returns home from World War I with a beautiful black horse that he saved on the battlefield, and names Thunderhoof. He enters the horse in a local race, hoping to earn enough money to save the family ranch of the girl he loves. However, the crooks intent on taking the ranch manage to capture a notorious wild horse and enter it in the same race, believing that it can beat Thunderhoof and thereby ensure that they're able to take the ranch.

An undercover agent tracks a gang of drug smugglers to their headquarters in Mexico, a nightclub, where he manages to get a job as a bouncer. There he meets and falls for a pretty young woman, whose father happens to be the man the agent suspects of heading the gang.

When Rin-Tin-Tin's master is found murdered, Rinty is accused of the crime.

Klondike the German Shepherd dog works with the Northwest Canadian Mounted Police to track down smugglers.

Bob and Jim Whitely are twin brothers. Bob, an army veteran who suffered shell shock in the war, escapes from a sanitarium and holds up the Express train, for which Jim is mistakenly arrested. Jim soon escapes from jail in order to find his brother. However, his task is complicated by a crooked sheriff who pins a holdup and murder on him that the sheriff himself actually committed. To make matters worse, the murder victim was Tommy Wilkins, the brother of Jim's fiancee, who now thinks that Jim killed her brother.

A soldier returns home from World War I with a beautiful black horse that he saved on the battlefield, and names Thunderhoof. He enters the horse in a local race, hoping to earn enough money to save the family ranch of the girl he loves. However, the crooks intent on taking the ranch manage to capture a notorious wild horse and enter it in the same race, believing that it can beat Thunderhoof and thereby ensure that they're able to take the ranch.