California Chrome has won the first two legs of horse racing's triple crown, but he may not go on to New York's Belmont Stakes.
The champion horse races with a nasal strip for breathing.
The three-inch-wide white strip can be seen above spanning the bridge of his nose at Saturday's Preakness Stakes.
The strip, while not illegal, is uncommon in horse racing, and in New York, that could create a problem, as a state rule says any equipment worn by a horse must be approved by the race stewards.
The State Gaming Commission said California Chrome's trainer may submit a request to allow the nasal strip before the June 7 race.
The horse has worn the strip in his last six races, which were all victories.
No horse has won the Triple Crown since Affirmed in 1978. Since then, 12 have won the first two legs but failed to win in New York.