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.

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.

Laddie (Son of Lassie) and his master are trapped in Norway during WW2 - has he inherited his mothers famous courage?

When Lassie's master dies, an old friend tries to convince a judge that the dog's life should be spared.

After years of prospecting, Jonathan finally strikes gold. He returns to town only to discover that his partner has since died and left Tommy fatherless. He decides to leave Shep (played by Lassie) with Tommy to cheer him up. Meanwhile, Jonathan's new partner, Lin, isn't interested in sharing the gold, and lures Jonathan to his death. Lassie immediately deduces what's happened, so Lin poisons Lassie. Lassie barely pulls through and pursues Lin to a climactic confrontation where, due to an off-screen accident with some liquid nitrogen, Lin's gun jams.

Set in the rural south of the United States, a bereaved war widow learns to put aside her bitterness and grief as she grows to love a young orphan boy and his dog.

William McClure is the villlage doctor in a remote Scottish glen. Tricked into buying Lassie, a collie afraid of water, he sets about teaching her to swim. At the same time he has the bigger problem that he is getting older and must ensure the glen will have a new local doctor ready.