King of the Herd (1927)

Arizona cowboy Paul Garrison vows to capture King, the stallion leader of a herd of wild horses. The horse, meanwhile, ingeniously frees a stable of horses from the ranch of wealthy Clarence Dorance, whose polo pony Diana VII is the apple of King's eye. Paul saves the endangered Nancy Dorance from the stampede and recovers Diana VII, only to have her stolen by Scar Satilleo, an Indian, who paints the mare so as to disguise her. King sees through this ruse and frees his love, only to be finally captured by Garrison and his pal, Zip Jones. The cowboy then enters the Santa Barbara polo matches astride King, defeats a persistent rival, Barry Kahn, and wins both the Travor Cup and Nancy's hand in marriage.