Hi/Lo is an upright hoof on one side and a low, usually long toe/low-heeled hoof on the other side; most often involving the front hooves; but supposedly can occur in the back. I think there are degrees of clubbed feet. Some are rather funky in shape with curvature giving them a ski slope or concave appearance, and these are usually more severe and where people often contemplate check ligament surgery because of tendon contracture. The article I attached references different causes of the condition though it doesn’t really hit on the congenital aspect much rather stating “predisposed”.
In my guy’s case, his foot is just somewhat boxy with no concavity or tendon contracture. His low hoof however is the typical long toe and run under heel.
