A horse was euthanized and the animal’s driver penalized after the 10-year-old Thoroughbred sustained a fatal injured during a chuckwagon race at the annual Calgary Stampede, which began July 3 in Alberta, Canada.

The Calgary Stampede features rodeo-style competitions and livestock exhibitions, including the GMC Rangeland Derby chuckwagon race, which pits four teams of horse-drawn wagons against each other in a series of elimination races over several days. Traditionally, each team consists of four wagon horses and four horses carrying outriders.

On July 4, the horse sustained a fractured cannon bone during the 6th heat of the day’s Chuckwagon Race, stampede management said in a written statement.

“This is considered a serious injury and, unfortunately, our veterinarian needed to euthanize the horse immediately,” the statement said