This is his left front, a much flatter foot than the right. You can see how his heels have got long and run forward. When the heels get long and run forward like this it can have quite an affect on the way the horse goes often causing pain in the heel region. It is very common for horses to have miss-match sized feet. This can be caused by a few things but if each foot is shod as an individual and has the shoe size fitted that it needs the horse will be just fine. Problems occur when feet are made to try and look a pair when structurally there not.