Cribbing is a behavioral problem, which sometimes develops in horses with insufficient mental stimulation (i.e. bored horses) and most commonly occurs in horses which spend long periods of time in stalls. Cribbing horses bite objects (such as fencing rails), while pulling backwards on the object and sucking air. It is believed that the horse does this because it causes the release of pleasurable brain chemicals (endorphins). The terms ‘wind sucking’ and ‘crib biting’ are alternative names for cribbing.

This habit is sometimes mistaken for wood chewing. Both activities involve biting on wood and causing damage to it. However, they are really different habits. With wood chewing, the horse simply nibbles on wood, typically to occupy itself and to meet its natural desire to chew. With cribbing, the horse does not chew on the wood but simply grabs it so that it can stretch its neck so that it can suck in air. Examination of the damaged wood will show the difference as in one case it will be nibbled away whereas in the other it will show signs of being firmly bitten and then pulled.

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.

A common treatment is the ‘cribbing strap’ which is a strap that fits around the neck with a metal plate underneath to making swelling the neck to suck air uncomfortable; this device is also known as a cribbing collar. One can also use a specially-designer muzzle which allows the horse to eat but prevents it grasping fence rails or other objects with its teeth. Putting a fencing wire (with electrical current) on top of fence rails will also keep the horse from cribbing on them. There are also a number of paints which are designed to have a foul taste which one can paint rails and other objects with to discourage cribbing on them (make sure that any product you use is veterinary approved). Some people find that anti-depressant medication helps. If none of the above techniques work, the final approach is surgical, consisting of cutting certain neck muscles and nerves and thereby preventing the cribbing activity.

One should do both activities, remove the cause of the behavior by providing more mental stimulation for the horse and also use one or more of the above techniques to discourage the behavior. Addressing the cause but not the behavior is normally only partly successful. Alternatively, stopping the behavior (e.g. with a cribbing strap) without fixing the root cause of intense boredom may simply result in the horse developing alternative behavioral problems.

Duber Stewart, owner of Horses For Sale wrote this article Horses Cribbing