Samantha's father's birthday is coming and her stepmom picked out a mustang for his present, but the new horse is so energetic that only Sam's dad could train him, if he decides to keep him at all.

Hank the Cowdog, head of ranch security, bravely faces the dangers of Picket Canyon to unravel the mystery surrounding an unusual cat. 5.8 3-6

When wildcats threaten the mustangs that live near Samantha's ranch, she wonders how she can save the horses without hurting the cougars. Samantha is outraged when a neighboring rancher vows to kill the wildcats that have been sighted recently in the area.

While vacationing at her uncle's sheep ranch, Trixie and the Bob-Whites track down the thieves who are behind the mysterious disappearance of several sheep.

It was no crime for a young cowboy to want to talk to a pretty girl, but that was what got Tom Lundy killed. The hard men of the Tumbling B, who had survived stampede and Kiowa lance to drive their herd up from Big Bend country, wanted to burn the town down. But Kate Lundy, the Tumbling B's owner, had a better plan. Calling on dozens of seasoned fighters, Kate aimed to strangle the town that lived off cowboy money but had no use for the Texans themselves....

Sam helps a horse which she at first considers a wild mustang, but later she begins to suspect that it might have an owner.