Rex, a wild stallion, and Rinty, a police dog, are pals. Their master , John Sheldon, is framed for murder, and Alice Ingram plans to race Rex for money to pay for John's legal defense. Meantime, Frank Nolan, who has falsely accused John, sets out to steal Rex for himself.

A fur trapper catches another trapper trying to steal his furs. He stops the thief, but later on the furs are stolen anyway. Rin Tin Tin Jr. tracks down the thief to try to get the furs back.

Rin-Tin-Tin brings the killer of his mistress to justice.

A 12 episode serial starring Rex, the King of the Wild Horses and Rin-Tin-Tin, Jr. Rex is brought from the island of Sujan, where he is worshiped as a God-Horse, to the U.S. to be trained as a polo pony. He escapes, meets Rinty and with the help of Frank Bradley is returned to Sujan. The natives have been persuaded to turn against their God-Horse, however he is rescued just in time before he is burned as a sacrifice.

An unhappy child, accompanied by his dog, runs away from home and is befriended by a gangster on the lam.

After suffering a traumatic injury, a policeman resigns from the force and, after he's saved from a suicide attempt, goes to work at a café frequented by gangsters.

Funds are embezzled and a fur trapper is murdered. Rin Tin Tin to the rescue!

Insurance Agent Ted Sanders has been called in to investigate a robbery and murder. A deputy also arrives to investigate. But unknown to Ted, the Deputy is a fake and actually part of the gang. The fake plants some of the money in Ted's room so he can arrest him. Then with the help of the gang he plans to finish Ted off.

Western, featuring Rin Tin Tin Jr., about a man trying to find an old friend in a town that is trying to deceive him.

The story of a boy, a dog, and a man. The boy discovers he is heir to a shipping line, and travels to Los Angeles, accompanied by inventor/radio operator Bob Whitlock and Irene Blaine. Their journey is aided by Pal, a wolf dog.