Trainer Bill Mott said the 3-year-old Gulch colt fractured both sesamoids in his left foreleg about three-sixteenths of a mile past the wire on the main track.
Listen Here had just completed a four-furlong breeze :49 under exercise rider David Wallace that was part of his preparation for the King's Bishop (gr. I) on Saturday.
The decision to put the homebred colt down was made after the owners and partners in the horse were notified. The principal owners Kim and Rodney Nardelli and Lewis Lakin.
Listen Here had a record of 4-3-1 from 10 career starts and earnings of $287,480.
The accident underscores the problems, uncertainty and stress trainers have to deal with every day.
"The help wonders sometimes," Mott said, "you've got a lot of horses working and you get on edge because you know that every time you do it there is a chance of something like that happening. Most of the time, nothing happens. But there is always that chance."