Why does my horse make egg-shaped circles?

Egg-shaped circles — where the circle is wider or rounder on one side and flatter or more elongated on the other — usually indicate that the horse is drifting, leaning, or losing connection to the rider through specific portions of the circle rather than maintaining consistent contact and body position throughout all 360 degrees. The most common cause is the horse drifting outward through the portion of the circle that faces away from the gate or the other horses, where the horse's natural pull toward the barn or herd produces an outward drift that widens the circle on that side. The opposite portion, where the horse is moving toward the gate, tends to tighten as it naturally wants to drift in that direction. The result is a circle that appears oval — wide on the outside, tight on the inside — rather than genuinely round. Leaning through the turns is a related cause: a horse that leans inward on one side of the circle will tighten the arc there, while a horse that falls outward on the other side widens the arc, producing the same egg shape through a different physical mechanism. Rider error contributes significantly to egg-shaped circles, particularly looking down at the horse or at the ground rather than at the path of the circle ahead. The rider's eyes lead the horse, and a rider who looks at the ground in front of them rides the circle wherever the horse's head goes rather than where the circle should go. Using arena markers — cones, fence posts, or memorized reference points on the fence line — to guide the path of the circle before adding speed gives the rider a visual target to ride toward rather than hoping the shape develops on its own. Correct the shape at a slow lope with clear reference points before adding speed, because speed amplifies whatever shape exists at the slower gait.