A toe clipped shoe will prevent a shoe being sheared backwards. A quarter clipped shoe will resist both backwards and sideways shearing. Over-reaching is a common reason for lost shoes. This means that the hind hoof catches the heels of the front hoof's shoe. S ometimes the special shoeing needs of some horses are the culprit for lost shoes.
Pads are a prime example.
Pads compress and expand as the horse loads and unloads the protected hooves. This compression and expansion of the pad cause nail clinches to come loose. Horses with pads require regular attention from a farrier. A nother example of the shoeing needs of the equine athlete being part of the problem is the wide webbed shoe. This style of shoe affords greater protection and shock absorption.