Among horse lovers, four-legged stars are often more popular than their human counterparts. That is certainly the case with the American Quarter Horse Docs Keepin Time, star of the Warner Brothers movie "Black Beauty." The stallion went from an unsuccessful racing career to one of Hollywood's most sought after equine performers. While playing the part, Docs Keepin Time had to perform many tricks, including working without a rider, rearing and even nodding and shaking his head. One particular scene involved a barn fire with Black Beauty trapped inside. Docs Keepin Time was coated with a fire retardant gel that protected him from the flames. By any standard, Docs Keepin Time is a Hollywood veteran. In addition to "Black Beauty," he played the part of the raring horse in the Busch Beer commercials, performed in a rock music video, and captured the hearts of Americans in the television series "The Black Stallion," and played the role of Gulliver in Robert Redford's screen adaptation of "The Horse Whisperer."