Definition of American quarter horse
- The trio will ride American quarter horses, the oldest surviving American breed and also the most numerous, with 800,000 registered worldwide.
- —Anne Hart, Atlanta Journal-Constitution, 1 Aug. 1996
- American quarter horses are the sport's drag racers—full of speed and power and always ready to run.
- —John Erardi, Cincinnati Enquirer, 11 Sept. 2008