The horse, trained by Wesley Hawley and ridden by Chris Landeros, fell at the top of the stretch in the day's second race. A pair of horses behind the incident threw their jockeys.

The son of Stay Thirsty, who entered the race with a record of 7-0-1 in 14 career starts, was examined by an expert team of veterinarians who observed a separation of two bones at their joint.

Horse Racing
The Irish are coming: O'Briens unite to tackle new-look Racing League
22/11/2020 AT 09:40

"During their triage and evaluation, they observed a disarticulation of his left front fetlock," Kenneland and Breeders' Cup said in a statement.

"Given the extent of the injury, it was unfortunately determined that humane euthanasia was in the best interest of the horse." (Reporting by Frank Pingue in Toronto, editing by Pritha Sarkar)

Horse Racing
Horse racing-Seventh placed runner handed win in Fontwell after disqualifications
16/11/2020 AT 06:46
Horse Racing
Horse racing-Authentic wins Breeders' Cup Classic
07/11/2020 AT 22:22