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Severe head shaking in horses is a pathological behavior. While some head shaking is a normal behavior, such as in a tool to escape insects or even a display of exuberance, excitability, or frustration, this behavior is considered abnormal in horses if it begins to interfere with normal activities such as riding or eating.
Horses with head shaking problems can either shake their heads horizontally (side to side) or vertically (up and down). The former is often linked to insect irritation or ear problems while the latter may be more indicative of a behavioral problem. Horses that shake their heads excessively due to insects do so much more frequently in the summer months. In other cases, if the head shaking is due to resentment of the rider or bridle, the horse may only head shake while being ridden.
Signs that accompany head shaking may include:
Identifying the cause of head shaking in your horse may be difficult, as there can be many different causes along with other causes that have not yet been confirmed. For some of the more difficult cases, there are theories that the horse may be extra sensitive to light or have chronic pain from a nerve in the face that causes a tingling sensation.
In many cases, head shaking is not attributed to any particular cause, but a few of the more typical causes include:
A diagnosis of head shaking is obvious; it is the underlying condition that poses the problem. A veterinarian may perform any of a battery of tests to get this diagnosis and find out what it is that may be causing the head shaking. In many cases, a cause for the head shaking may never be found.
Something that is related to the whole body and not just one particular part or organ
A bundle of fibers that are used in the process of sending impulses through the body
Any type of arachnid excluding ticks
a) A part of a horse harness that holds the bit and reins together. b) A rope with hooks at both ends.