Thunder in the Valley (1947)

A story of the Scottish highlands about a crockerty old sheepherder, Adam MacAdam (Edmund Gwenn),who loves his prize collie dog, but little else, not even his son Davis (Lon McAllister). But David, with the help of a neighbor's daughter, Maggie Moore (Peggy Ann Garner), raises his own prize dog and beats out his father in a contest.