Dressage rider here. Absolute no-go conformation faults that I think would apply for most disciplines are things that either make the horse significantly more challenging to manage, e.g. very roached back (saddle fit), or parrot mouth (bitting, feeding issues) or that are not conducive to long term working soundness: poor hoof quality, small hooves relative to size, misaligned hoof/pastern angles, hoof/pastern angles that are too far in either direction (too upright or too low), back at the knee, etc. Not to say that those absolutely preclude a horse from being happy and sound with management, but for me I feel theyāre too risky.
Conformation I steer clear of: Long (weak) loin, straight behind, neck tied in low, truly ādownhillā (a slightly ādownhillā back is fine, but hocks way above knees? no thanks), upright shoulder (almost always goes along with very upright front foot/pastern angles, so already ruled out for me anyway), true ewe neck, significant hi/lo feet.
Conformation āflawsā I donāt really mind: a long back - as long as itās long through the thoracic region and not the lumbar. No long loins! Over at the knee, toed out mildly, a slightly upright pastern angle so long as it matches the hoof and has a good quality/size hoof underneath.
Can you tell Iāve been burned by hoof issues in the past? :lol:
I think when it comes to conformation, itās important to look at the whole picture (how does the horse fit together), and also assess their history of soundness and performance.There are plenty of horses with less than ideal conformation performing their jobs splendidly and staying sound doing so - sometimes with a bit of extra maintenance or management, sometimes just because the whole is more than the sum of the parts