A huge Rottweiler the size of King Kong (according to Hank) threatens the security of Hank the Cowdog's ranch.

"After his many years as a typical bachelor cowboy, Slim Chance is convinced-- against his will-- that he needs to build his own herd of cattle and invest in the future. So, he takes the plunge, takes out a loan, and takes his newly-bought heifers to a pasture on Viola's father's ranch. But, just about the time his new herd is calved-out and his investment is beginning to look promising, the dry and windy weather conditions put the entire county on...

When the ranch's head rooster corroborates a report about a strange tree eating creature, Hank investigation leads him to a three-toed sloth.

When Happy the Lab returns to the ranch, Hank finds him to be a loyal and helpful friend as he deals with food poisoning, investigating the machine shed, and rumors of a mountain lion.