Thunder in the Valley is a 1947 American Technicolor drama film directed by Louis King and starring Lon McCallister, Peggy Ann Garner and Edmund Gwenn.

[1] It is based on the 1898 novel Owd Bob by Alfred Ollivant, which has previously been adapted into a 1938 film of the same title.

A crockerty old sheepherder, Adam MacAdam, loves his prize collie dog, but little else, not even his son David.

But David, with the help of a neighbor's daughter, Maggie Moore, raises his own prize dog and beats out his father in a contest.

[3]: 288 Peggy Cummins was initially cast in the lead female role following her being moved off the production of Forever Amber.