Hank the Cowdog is about to go on the ride of his life! When Slim's pickup truck breaks down, the ranch ends up with a brand-new model on loan while the old one gets fixed. But a ranch dog like Hank isn't used to power windows and door locks, and he gets into a heap of trouble with the push of a button. Will Hank be able to find a way out of this latest mess?

A convoy of circus trucks is passing through the ranch. The last truck in the column hits a bump and a large red box falls off and comes to rest in the pasture. Hank and Drover investigate the box and discover that it contains a circus monkey. Pete advises Hank not to open it, but Hank's curiosity gets the best of him. What follows is fun and adventure.