Blind quicking, however, may be serious because the farrier doesn't know about it. This happens when a nail bends inward after it enters the foot, therefore exerting painful pressure on sensitive tissues. It may be difficult for the nail to surface in hard feet, causing a small bend that exerts pressure inwardly. In such cases a horse may become lame from four to ten days after being shod. Appropriate treatment should be given quickly.
Many horses have shoes left on much too long.
The maximum time to leave shoes on a horse is approximately six weeks. Horses wearing shoes much longer than this are likely to overgrow the shoe at the heel and walk over the outer branches. Long toes exert great pressure on tendons. Correct this by removing the shoes and trimming the hoof properly. Colic is pain in the abdomen, usually involving the stomach or intestines.