Wild Horses Don't Wear Shoes
why should yours?

And the horse not only survived, but thrived, multiplying and filling much of the earth, with no iron on his feet. In many places where the horse lived, the ground was harder, rockier, and drier than most domestic horses will ever see. Mares, stallions, and foals roamed farther in a day than most of our beloved equine companions travel in a week - and they did it barefoot. If the hoof is an evolutionary weak point, the Spanish horses that escaped or were turned loose in North America centuries ago would have struggled for survival; instead, these mustangs numbered in the millions.

So when and why did we start nailing iron to our horses' hooves? We can debate the horseshoe's origin all we want, but it matters only because many of today's horse owners truly believe that their horses simply cannot go without shoes.
But maybe they can.

Nature created a marvelous structure in the hoof, and there is a growing awareness that this hoof is capable of impressive accomplishments. It can cut, rein, jump, rope, trail ride, and drive. It performs exquisite, subtle dressage movements and races anything from barrels to endurance rides. All without added iron.

In addition, some conventionally shod horses who are chronically lame are finding renewed usefulness and comfort without shoes. Their hooves gradually heal as the hoof regains its natural form through quality trimming and natural horse keeping practices.

In the end, there will still be the horse. Without shoes.