On their way to start a new life at a sheep farm in rural Virginia, the Turner family are halted by a wreck on the highway that has claimed the life of a truck driver. Spotting the trucker's now-abandoned collie on the side of the road, they take pity on the dog and adopt her. As the city family copes with the change to rural life, including a feud with a neighboring farm family who resent the city interlopers, the ever-loyal Lassie helps them adjust to their new surroundings.

Lassie is the pet of Jeff Miller, an 11-year-old farm boy. The two become best friends and enjoy family adventures in the American countryside, teaching each other about love, nature and commitment.

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

The Stratton kids, Samantha and Chip, and their grandmother, Ada, drive to visit their Uncle Stuart. Grandma collapses and dies in a strange town, leaving the kids and Lassie on their own.

After Santa Barbara Police Chief Carlton Lassiter is ambushed and left for dead, Shawn and Gus return to help him and find themselves embroiled in a case involving the personal, the professional – and even the supernatural.

本片根据二战阵亡的英国少校艾瑞奈特的名著改编。故事发生在大萧条时期的英国约克郡。山姆·盖克劳家境贫困，柯里犬莱西是他唯一值钱的东西，同时也是他儿子乔·盖克劳的好伙伴。迫于生计，山姆将莱西以15金币的价钱卖给公爵。莱西两次从公爵家逃回家，都被山姆送回。最后，公爵将莱西带到了苏格兰。而公爵的孙女普西拉答应乔照顾莱西。在苏格兰期间，普西拉帮助莱西从公爵的犬舍工人汉斯处逃跑。莱西又踏上了回到乔身边的旅程。路上，莱西被牧羊人放过，游过大河，得到一对老者的救助，商贩白先生的帮助，同时也在失业者抢劫白先生时给予他帮助。又躲过捕犬人的追捕，虽然摔伤，但还是回到了乔家。此时，公爵找上门来，尽管认出莱西，还是让她留在乔身边，并聘请山姆做了他的犬舍工人。莱西终于又与乔成了好伙伴。