A lad is heartbroken when his impoverished parents are forced to sell his beloved collie to a wealthy duke. However, although her new owners are pleasant enough, the plucky dog is determined to be reunited with her young master, and sets out on a long and dangerous journey home. Family drama, starring Elizabeth Taylor, Roddy McDowall, Donald Crisp, Edmund Gwenn and Nigel Bruce.

Hard times come for the Carraclough family and they are forced to sell their dog, Lassie, to the rich Duke of Rudling. Lassie, however, is unwilling to remain apart from young Carraclough son Joe and sets out on a long and dangerous journey to rejoin him.