Sham (April 9, 1970 – April 3, 1993), an American thoroughbred race horse, was one of the leading racehorses of the 20th century but was overshadowed by his more famous peer, Secretariat. Sham was a dark seal brown in color. While racing, he wore green and yellow blinkers. His preferred running style was that of a closer, stalking from behind to make a late rally. Sham was a large horse at 16.2hh. He also had a very large heart, about twice the size of the average horse's, according to Dr. Thomas Swerczek, a University of Kentucky veterinary scientist.