When a New York City fashion designer returns home to her family's struggling farm, she finds new purpose training a herding dog, and discovers that her four-legged shepherd has the talent to turn an increasingly inhospitable cattle farm into profitable sheep country in "You Lucky Dog." After the sudden death of her mother, Lisa Rayborn (Henstridge) travels home to small-town Rockton, where her brother, Jim (Hamlin), and dad, Clay (Lawrence Dane, "Bride of Chucky"), are still mourning. To make matters more difficult for the family, Jim has begun raising Merino sheep on the farm against his father's wishes. Jim hopes the Merino fleece would turn a better profit for the farm, but without a superior working dog, his sheep have instead made him the laughing stock of the town. Deciding to stay home to help, Lisa goes to the local animal shelter and adopts Lucky, a Border Collie who Jim's prime nemesis in ranching has just dumped. Jim wants nothing to do with Lucky knowing his biggest competitor thought so little of the dog. But Lisa, who sees the underdog in herself reflected in the pup, works vigorously with Lucky, and the dog shows such remarkable progress that the siblings decide to enter her in the town's annual herding dog contest. But when unforeseen disasters put more than prize money in jeopardy, Lisa and Jim must ask more from Lucky than they ever could have .