As the Breeders’ Cup World Championships approaches next weekend, another horse died at Santa Anita Park — the event’s host — on Sunday, bringing the track’s death toll to 36 and renewing anxiety over whether the landmark California racetrack is safe enough to welcome the world’s best racehorses and host North America’s richest days of racing.

Bye Bye Beautiful was euthanized after the third race, after being pulled up past the mile pole. The 2-year-old filly sustained a right forelimb lateral condylar fracture with medial sesamoid involvement. Her rider, Tiago Pereira, was not injured. Bye Bye Beautiful finished fourth in her first career start last month.

“The thoughts of the team at the Stronach Group and Santa Anita go out to everyone who cared for the filly, including trainer J. Eric Kruljac and his staff,” the racetrack said in a statement.

On Friday on Santa Anita’s training track, another horse, C Q Covergirl, injured both of her front legs and was euthanized. In all, six horses have died at Santa Anita since the track reopened last month, an alarming number considering that 30 horses had to be euthanized on its premises from Dec. 26 to June, prompting law enforcement investigations and calls from animal rights activists for the track to shut down.