Could there be variations of structure – within the confines of how a good dressage horse must be constructed – that could explain the differences in performance abilities?

A Trend

I have noticed a trend at the top levels of the sport (Olympics, World Cup Finals, World Equestrian Games, etc.) in the last decade or so: those horses that excel at the collected movements (particularly piaffe and passage) tend to have an ilium side (point of hip to point of buttocks) that is ‘flatter’ than those that excel in extension. A flatter ilium side could also be described as showing less slope from point of hip to point of buttocks, or as the ilium being closer to being parallel to the ground. Regardless of the terminology, the result is that those individuals shine in piaffe and passage, especially if the angle formed between ilium side and femur side is larger (more open).

That being said, the ilium/femur angle is not the only factor for superior abilities at either collection or extension. Horses with lower stifle placement, as determined by how far the stifle’s protrusion (not the actual patella) is below the bottom of the sheath on a male horse (or where a sheath would be if judging a female horse) in general, have a longer stride due to the increased range of motion that the lower stifle allows. Such horses also have to compress more to please the riders, trainers, and judges in the advanced movements in collection.

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