How can I get my horse under controll whils galloping in an open feild?

To add to Lakelady's answer and respond to your additional details: race horses, especially sprinters and barrel racers, are capable of such speeds; however, they can usually sustain that speed for only about 2 or 3 miles. Most sprint races are considerably shorter than a mile. A steeple-chaser galloping over a two-mile jump course probably goes 30-35 mph; an eventer galloping over a 6 mile cross-country jump course, in which the huge, tricky fences also tap his energy, probably goes 30 mph max.

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