My Friend Flicka - "The Runaways" (1956)

Flicka runs away from the ranch to join Rebel, Rob's magnificent half-wild stallion, who has been mistaken for an albino killer horse. Ken follows Rebel to a hidden valley in the hope that he will find Flicka.. Not only does he find Flicka, but a herd of about sixty mares the wild stallion lured from neighboring ranches.
https://www.imdb.com/title/tt0654615/plotsummary…

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