When a playful Collie pup is shot by a young boy (Carl Switzer), young Kathie Merrick (Elizabeth Taylor) rescues the injured canine and nurses him back to health. Kathie nicknames the dog Bill and begins to train him to be a sheepdog on Harry McBain's (Frank Morgan) farm. Unfortunately, Bill is hit by a car and suffers from doggie amnesia -- but later becomes a war hero when he serves as part of a canine unit.