Understanding and Treating Horse Cribbing

Cribbing is a compulsive behavior, which horses sometimes develop as a result of boredom, typically resulting from being left in a box much of the day with nothing to do. It consists of the horse firmly biting an object, arching its neck while pulling on the object, and sucking in air. It is believed that this triggers the release of chemicals (endorphins) in the brain, giving a pleasurable sensation. Cribbing is also known as ‘wind sucking’ or ‘crib biting’.

Horse cribbing is sometimes confused with wood chewing but the two are different problems. A wood chewer simply nibbles on the wood, which is a habit that is easily treatable. A cribber pulls on wood (or other objects) while sucking air in order to release brain chemicals, which effectively makes it a drug addiction, and consequently much more difficult to cure.

Over time, cribbing will wear down and damage the horse’s teeth. The pulling motion results in an abnormal muscle development in the neck, making it thicker. A number of other illnesses, such as colic, are associated with cribbing but the relationship of these illnesses is unknown (e.g. does the colic pain promote the habit, or does the cribbing air sucking cause the colic, or are both colic and cribbing simply more likely in horses which lack pasture time).

Ideally, one should prevent the development of the cribbing behavior by providing the horse with as natural and interesting environment as possible. Once a horse has cribbing, the situation is more difficult, but one can greatly reduce the frequency of cribbing by providing a mentally stimulating environment. The first step is to provide as much pasture time as possible. One should also make the feeding regime as natural as possible, consisting of pasture grass if possible and hay as a second choice; foods such as grains which can be quickly eaten with minimum chewing are the least desirable. In addition, many small feeds are preferable to a few large feeds, as this helps break up the day. Any other activities which provide interest, such as exercise and grooming, will make a positive contribution.

An interesting environment will normally prevent the development of cribbing, and help already cribbing horses to reduce the amount of cribbing. Unfortunately, once the habit is established, this in itself will seldom cure it completely. One needs to combine this action with treatment to physically prevent the horse from cribbing, in order to eventually break the habit.

One common approach is a cribbing strap (also known as cribbing collar), which fits around the neck and holds a small metal plate to the underside of the neck, making cribbing uncomfortable. Alternatively, one can use a special muzzle which fits over the head, preventing the horse from reaching objects with its teeth but still allowing it to feed through the metal grill. Painting fence rails with a specialty paint which gives them a bad taste (use only the veterinary approved paints) will discourage cribbing on them, as will adding a fencing wire (with electrical current) to the top of rails. Some horse owners have also reported improvements with certain medications (e.g. anti-depressants for the horse). Finally, there is a surgical solution which involves cutting certain neck muscles and nerves to make cribbing physically impossible, although this should be seen as a final option.

It is important to both address the base issue (intense boredom) and to try to physically discourage the horse using one of the above approaches. Trying just one or the other is seldom effective.