What qualities make a horse well suited for barrel racing?

The qualities that make a strong barrel racing prospect combine natural athletic ability with a competitive temperament, correct conformation for the demands of the pattern, and the trainability to learn and repeat a precise, technical maneuver at speed. Speed is an obvious requirement, but raw speed without the ability to turn correctly and maintain balance through the pattern does not produce winning times. The horse must be able to rate — meaning slow its pace in preparation for a turn — without losing impulsion, complete a correct, tight turn around each barrel, and then accelerate powerfully out of the turn and down the next straight line. This combination of speed, rating ability, and turning athleticism requires a horse with strong hindquarters, a short back, correct shoulder angle, and the physical coordination to collect and drive simultaneously. Temperament matters significantly in barrel racing because the pattern is run at full speed in a competitive environment that is often loud and stimulating. A horse that is too reactive will be difficult to rate and will run past barrels or knock them over with its shoulder. A horse that is too laid back will not produce the competitive speed and drive the pattern requires. The ideal temperament is eager and competitive but responsive to the rider's rate cue. Quarter horses dominate barrel racing because the breed's combination of explosive speed, hindquarter power, and trainability suits the demands of the pattern exceptionally well, though Appendix Quarter Horses, Paint Horses, and other breeds compete successfully at all levels.