[Arcadia, California; November 7. Image via Getty]

Fans of the horse Zenyatta before the five million-dollar Breeders' Cup Classic race which she won at the Santa Anita racetrack in Arcadia on November 7, 2009. The Breeders' Cup features 14 races worth 25.5 million-dollars over two days and is capped by the five million-dollar Classic. AFP PHOTO/Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)

[Arlington, September 10. Image via Getty]

An artist of Cavalia performs during a special media preview in Arlington, Virginia, on September 10, 2009. Cavalia, an orchestration of multimedia, equestrian and performing arts, has a large number of viewers worldwide. This multimedia extravaganza features more than 100 two-and four-legged artists, including beautiful horses of 12 breeds, riders, acrobats, aerialists, dancers, and live musicians. AFP PHOTO/Jewel SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

[Birmingham, UK, October 10. Image via Splash.]

[Image via Getty.]

Heather Fell of Great Britain on her horse 'Lele' clears a jump during the women's riding in the modern pentathlon event of the 2008 Beijing Olympic Games at the Olympic Sports Centre stadium on August 22, 2008. (INDRANIL MUKHERJEE/AFP/Getty Images) — Getty

Read more coverage of the 2008 Olympic Games.