A horse that specializes in the sport of reining—a rodeo event where the horse performs precise sliding stops and spins.
From 'rein' (the strap used to control a horse) + '-er' (one who does something). A reiner is literally a horse trained to respond perfectly to the reins, especially in the Western riding discipline.
Reining is sometimes called the 'dressage of the West'—these horses can slide 20+ feet on their back legs with perfect control, creating dust clouds that rival any action movie! It's been a major rodeo sport since the 1800s when cowboys developed it from working cattle.
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