Courage of Lassie
Bill's separated from his litter, making friends with the wild creatures until he's found and adopted by young Kathie. An accident separates him from her, and he's drafted into K-9 duty in the trenches until battle fatigue takes its toll and he turns vicious. And even though he finds his way back home, he may be condemned as a killer.
Elizabeth Taylor
Kathie Eleanor Merrick
Frank Morgan
Harry MacBain
Tom Drake
Sergeant Smitty
Selena Royle
Mrs. Merrick
Harry Davenport
Judge Payson
George Cleveland
Old Man
Catherine McLeod
Alice Merrick
Morris Ankrum
Farmer Crews
Mitchell Lewis
Gil Elson
Jane Green
Mrs. Elson
David Holt
Pete Merrick
Bill Wallace
Sergeant Mac
Minor Watson
Sheriff Ed Grayson
Donald Curtis
Charlie
Clancy Cooper
Casey
Carl Switzer
First Youth
Conrad Binyon
Second Youth
Robert Emmett O'Connor
Deputy (uncredited)
Byron Foulger
Dr. Coleman (uncredited)