i don't know, but that horse seriously didn't want to enter the starting gate. it was bucking like a wild bronco, though, they really did try very, very hard to get that horse in. after the scratch, they gave everyone more time to replace/fix their bets, if necessary.
thanks, i wasn't going to bet until i saw zenyatta before the race at the paddock -- she is an awe-inspiring horse and just looked so poised to win.