Navicular Disease Is A Serious Problem

By Alta Alexander


Horse owners rightly fear the problem of founder in their animals. One cause of navicular disease, foundering usually affects the front feet of a horse, resulting in lameness which can be permanent. There are other causes of navicular problems which are still being researched by equine health experts.

The term 'founder' is used to describe the discomfort a horse experiences when it eats too much rich grass or grain. The result is an inflammation of the digestive tract and of the front feet of the animal. Severe cases can result in death and/or permanent damage to the feet. A horse allowed unlimited access to lush grass or the feed room can quickly develop symptoms of founder.

Severely overweight horses are more susceptible to founder. An animal which is foundering is reluctant to move and may stand with front feet stretched out, shifting weight from foot to foot. Being too heavy also puts undue strain on the front feet, which support up to seventy-five percent of the horse's weight.

Ponies are affected more often than horses, but animals of any size are at risk. It is easier to keep horses from gaining weight than try to get it off; horses may become anemic or develop vices from boredom, like cribbing or weaving.

Another cause of navicular problems is concussion. Pounding on hard ground day after day is not natural for a horse. This condition often affects heavy horses, like warmbloods, who are asked to work and jump on a regular basis. These sport animals can be very talented, which makes this susceptibility unfortunate for both horse and owner. Allowing an animal to reach full maturity before being put into heavy work can help, as can varying work sessions with less strenuous exercise on yielding ground.

Other causes include standing too much, as when a horse is confined to a stall and not allowed sufficient time out at exercise. Forcing growth with rich feed, as is commonly done with thoroughbred youngsters destined for the yearling sales, can have detrimental effects. Race horses and show animals are routinely stalled for their protection, given demanding training schedules, and kept on high energy feeds.

Improper shoeing or trimming can contribute to unsoundness. If the foot is not properly balanced, with the weight spread evenly from toe to heel, the bones of the foot may shift out of position over time. Long toes and heels allowed to slope too far under the foot are less than ideal, and this configuration puts strain on the tendon that passes over the navicular bone and connects to another bone called the coffin bone. If the coffin bone is pulled out of alignment, lameness will result.

Lush grass is a danger to all horses and ponies and should be limited. Feed rooms must be securely closed to keep greedy horses out. Exercise programs should be designed with the animal's age and conformation in mind, and riding done over firm but yielding ground. Owners who want their horses to stay sound should learn how to make sure their farrier is doing a good job.




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