You've run the good race, boy. Over $700K in lifetime winnings, you did your job well. You learned to be a normal horse, too, though it was difficult for you to let the racetrack go. You laid down in the lush, safe pasture of Kentucky with your dear mare-love beside you and went peacefully. Got the email this morning from Dawn, who took excellent care of you.
I love you and am glad you were able to eventually enjoy your life as a horse.