A lost dog tries to find his way back to his beloved master in the final film of the Rusty series.

Danny Mitchell and his canine pal Rusty befriend blind girl Penny Moffatt. Feeling cheated by life, Penny resists all efforts to cope with her handicap. But with Rusty's help, the girl gains a new lease on life and agrees to adopt a seeing-eye dog.

Faithful dog Rusty helps his master's father win a mayoral race.

A young Czechoslovak orphan, Loddy Bicek, befriended by an American army sergeant, is brought into the United States as a stowaway by the soldier. He is apprehended, but escapes and makes his way to the sergeant's home town. There, he is befriended by young Danny Mitchell and his dog, Rusty, a K-9 veteran of World War II. A third boy reports Loddy to the authorities, and when Loddy tries to run away, he falls into a deep ravine.

Fearing that his recently-acquired step-mother, Ann Dennis, is competing with him for his father's affections, and saddened by the death of his dog, young Danny Mitchell seeks consolation in the companionship of a ferocious, Nazi-trained police dog, Rusty, brought to the U.S. by a returning WWII-veteran. The step-mother, with tender understanding, eventually wins Danny over while Danny pacifies his new dog.

A stubborn farmer is raising his children alone. When his oldest daughter gets a suitor, the father nearly goes on the rampage, but he is forced to change his tune when he is injured, leaving her in charge of the farm.

Wilbert Winkle, a henpecked, mild-mannered, middle-aged bank clerk and handyman finds himself in the midst of battle in the South Pacific.