Cowboy With a Cause - The New York Times "People were telling me it couldn't be done," the craggy, white-haired man in the denim shirt says. And that's the wrong thing to say to a cowboy. Dayton O. Hyde, 88, is speaking in an early scene of "Running Wild," Suzanne Mitchell's quietly grand documentary about him and about his impractical, long-ago plan to create a sanctuary for wild mustangs. And the cinematographer Mauro Brattoli's exquisite shots of the horses running free on Mr. Hyde's Black Hills Wild Horse Sanctuary in South Dakota make it exhilaratingly clear that his efforts have paid off in immeasurable ways. Mr. Hyde was born in Michigan; left home as an adolescent to work on his uncle's ranch in Oregon; saw action in World War II; received an English degree from the University of California, Berkeley; built a family ranching business; and is the author of a score of books, largely about the West that he loves. He was in his 60s when he decided to save the mustangs, which were being captured and slaughtered. The burning question is why Mr. Hyde's story has never been made into a feature film. You've got big sky, a crazy but magnetically confident old coot, a noble but seemingly hopeless quest and a triumphant ending. There are even subplots about the family (college sweetheart wife and five children) and a younger woman. Mr. Redford?