Feet all out of proportion and at the wrong angle and not level will cause scalping. Now if the animal has very little hock action and mostly stifle action, I would lower and shorten the toes of the hind feet as much as possible, use a square toe shoe and raise the heels with a side calk, this will shorten the stride and by adding some weight to the hind shoe it will increase hock action. Most all scalping is done with front or outside toe of the front shoe coming in contact with the coronet of hind foot. It hurts the horse so much that he will try to find some way to avoid it; some trainers use a gaiting pole to prevent the horse from going crooked in the shafts because of this fault.
If the front action is low, long and of a sluggish nature, shorten the toes of feet considerable and add about five ounces more weight to the shoes, or more, if required to create a more lofty knee fold. The action of some horses requires a lot more weight than others to make the change. The shoes to be used, if working to make speed should be a square toe shoe, or a beveled toe shoe, also a wedged shaped shoe thick at the heels and thin at the toe is good, squared at the toe. For ordinary road driving a rolling toe shoe is good, but not for extreme speed, as it has a tendency with most horses to slip back too much on leaving the ground; and the horse should be made to carry his head higher than usual. If the front action is high, short, or too rapid, not working in harmony with the hind, lower the quarters and heels of front feet as much as they will stand and keep a fair length toe on the front feet and shoe with a very light shoe and use a toe weight to balance for extension, place a spur for toe weight well up on toe of foot out of way of the scalping; and the horse should be made to go as low headed as is comfortable to him.
If the hind action is low, long or of a dwelling nature, shorten the toes as much as they will stand, and shoe, to elevate the heels, with a thick heel shoe, or raise the heels with side calks. A few ounces more weight than he has been carrying will be all the better to make him use his hocks more. If the hind action is high and choppy with not much extension, lower quarters and heels as much as they will stand and keep a fair length toe on him, it will keep him closer to the ground; and shoe light to prevent slipping.