The Horseracing Regulatory Authority is holding an inquiry after reviewing TV footage of the incident at the Stratford races on Sunday.
TV replays showed the horse, City Affair, being unruly in the parade ring, ultimately throwing O'Neill. The jockey got to his feet and grabbed the reins, before lowering the butt of his helmet into the horse's nose.
City Affair went on to finish fourth in the two-mile event. O'Neill was given a caution by stewards for his use of the whip in the race, according to the AP.
O'Neill's actions will be reviewed at an HRA disciplinary hearing on Aug. 3, where he is expected to face a fine and short ban.
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