While the original title, "Trailing the Killer" isn't a misnomer, it was a bit misleading since the "trailer" is a dog named Caesar (Caesar the Dog) and the killer is a mountain lion. But the makers also pointed out that Caesar "is the most intelligent dog actor since Rin-Tin-Tin" which probably lured a few Rin-Tin-Tin fans with a show-me attitude. Caesar prowls around the woods of the Northwest, dispatches a rattlesnake, visits his she-wolf mate and their pups, pauses to watch the dainty habits of a raccoon personally washing every morsel of food before eating it---and that raccoon had enough food to use up several minutes of running time---and then saves sheepherder Pierre (Francis McDonald)) from getting eaten by one mean mountain lion. Rin-Tin-Tin he ain't, but then who was?

A young Eastern lawyer, seriously injured in a stage holdup, secures the help of Hoppy, California and Jimmy in completing his mission to his woman cousin's ranch in Texas. The ranch, as are others in the same area, is being plagued by a gang called the Night Riders, while the friendly local town lawyer is trying to cajole the cousin into selling out to him. Hoppy begins by arriving in the town, separate from his pals, all spiffed up and dandified, posing as the Eastern lawyer...

Cowboy is hired by an archaeologist to help find "Hidden Valley", where an Indian gold treasure is supposed to be buried. Just when he finds it, the archaeologist is killed, and the cowboy his charged with his murder.

Montana Marshals Gene and Scat are tracking some bank robbers. When the baddies cross into Canada, the Mounties are called upon to help.

Hoppy and his pals arrive in a remote town to investigate the counterfeiting of both U.S. and Mexican money; his only clues are the name "Mordigan" and a drawing of a comet. He quickly finds out that Mordigan is the town "boss"; but what or who is "the comet", and why are Mordigan and his henchmen intent on persecuting a young woman, her drunken brother, and her deathly ill sister-in-law who've also just arrived in town?

Bill Elliot is back as Red Ryder in Cheyenne Wildcat. Also back are Ryder's perennial cohorts Little Beaver (Bobby Blake, later Robert Blake of Baretta fame) and the Duchess (Alice Fleming). When not pummeling the bad guys, Ryder is the reluctant apex of a love triangle.

Retired lawman Kentucky Wade and his three buddies, Mike Morales, "Dude" Hanford and "Trigger" Benton come to Brimstone and help their friends Larry Munro and his sister, Lucy , in their fight to retain control of Larry's rich ore mine. "Doc" Hardy , as an old friend of Wade's, joins them in their efforts to keep Matt Keeler , the scheming owner of "The Brimstone News", from his efforts to wrest control of Munro's property and mine. Keller employs a legion of henchmen, and sidelines at running runs guns to Red Hatchet and his tribe so they can also get in on the fray against the Munro's and Kentucky and friends.

Captain Timothy 'Two Gun' Nolan is appointed head of the New York detective force, and as his first act, rounds up every criminal in town. Gang boss 'Dapper' Frank Trent stands bail for all of them as independent minor gang-leader. Setting out to get Trent, Nolan moves in on his hideout, assisted by his friend 'Shakespeare.' Trent kills Shakespeare, but makes Nolan believe it is his shot that has done so. Nolan resigns his commission and becomes a drunk. Found unconscious by Trent, he is offered as the pièce de résistance at a gangland banquet which 'The Magpie' attends. A lost film.

A series of reversals bring two desperate people together. When a saloon owner is framed by his partner for a stagecoach robbery, he fights to secure an acquittal.

A priest hears a murderer's confession but can't reveal the truth, even though his brother is being tried for the crime.

The coming of the railroad to Cedar City spells the end of the stagecoach as the government gives the mail contract to the fastest means of delivery. McCord loses the stagecoach line gambling with the new buyer, but has enough hidden money to buy a ranch and some cattle. To make more money, he starts a gang to rob the railroad, express offices and steal cattle. But the railroads send out special agent Cameron to end his reign of violence.

A sheriff and his posse set out to catch a murderer, but their mission proves more dangerous than anyone suspected after they become stranded in the desert and attacked by Apaches.

When his tribesmen begin killing off white settlers, Young Eagle is opposed to the carnage. In order to assure a lasting peace, however, the chief must deal with renegade Apache Black Wolf.

Bob Curtis (William Gargan), the youngest member of the New York City plain-clothes squad, is assigned to help Detective-Sergeant Doyle (Paul Hurst) uncover the people behind a number of fur robberies. Peggy Arnold (Marian Nixon), a beautiful girl, comes under suspicion, but Bob, convinced of her innocence, adopts a desperate plan to clear her and round up the real criminals.

Sailor Joe Hart, who is spending his shore leave at a gambling joint, sells his gun to young Laurie Roberts after losing terribly. After Hart again loses his last dime, he leaves the joint and steals a car in order to return to his ship. Later that night, a tough gambler named "The Weasel" convinces Laurie, who also lost badly, that Baldy, the joint's owner, is crooked, and they both return to the joint to break open the safe. During the holdup, The Weasel kills Baldy with Joe's gun and, after being picked up for speeding, Joe is arrested for murder.

20 years ago, 3 men robbed a stage and hid $30,000. They were caught and sent to prison by Marshal Steve Autry. 20 years later, the men bust out of prison and return to the ghost town where they stashed their treasure searching. Steve's grandson picks up where Steve left off to foil the plans of the outlaws.

Showgirl Tony Landers, supported by her friend Flip Daly, fights for the custody of her son during a divorce hearing.

A Canadian Mountie allows an innocent fugitive to escape with the women he loves.

A young lady, who "hates the law" rises from the tenements to society. Financial reverses lead her to commit a series of burglaries as "The Bird". She becomes involved with the detective investigating the burglaries. After she confesses and pays for her crimes, they marry.

Wounded while stopping the James gang from robbing the local bank, a cowboy wakes up in the hospital to find that he's been elected town marshal. He soon comes into conflict with the town banker, who controls everything in town and is squeezing the townspeople for every penny he can get out of them.