Running Wild: The Life of Dayton O. Hyde examines the inspirational life of Dayton O. Hyde as a modern-day renaissance man and one of the last old-style cowboys. Through heroic determination, he is preserving part of the American West with a breathtaking 12,000-acre prairieland Black Hills Wild Horse Sanctuary in South Dakota that he has maintained for the last 25 years and where more than 500 mustangs now run free—all rescued from the controversial wild horse roundups in the west.