By Sue McDonnell
My gelding, whom I bred and raised, has always seemed moody, especially compared to my other horses. I swear he came out of the womb with his ears pinned! One day he’s happy and ready to work or eager for attention, the next he’s sour and grinding his teeth. Some days he’s anxious, and some days he’s calm. There’s no rhyme or reason to it. I know some people feel mares are moody, as well. Is there any research about horse moods and how they influence training?
Emotions have a powerful influence on how an individual behaves and views the world.¹ The negative emotions that go along with mood swings can lead to pessimistic thinking and impact quality of life. Exactly what causes moodiness isn’t well understood. Various aspects of a horse’s environment and biology affect its emotional state, and a few of these are presented below.
What Causes Mood Swings?
A veterinarian should exam a horses that experience mood fluctuations or persistent negative emotions. Moodiness can be a sign of underlying health issues that flare up periodically, such as allergies, joint and muscular pain, gastrointestinal issues, and disorders of the nervous and endocrine system. In humans, mood fluctuations are also associated with psychiatric conditions such as depression, bipolar disorder, and attention-deficit hyperactivity disorder. Whether horses suffer from these same mental disorders is not known. Previous injuries can cause occasional discomfort and associated changes in mood. If your horse grinds his teeth, it could be a sign that he is experiencing physical discomfort or stress.
Anxiety and stress
Moodiness has been linked to anxiety, and a string of bad days can lead to a loss of emotional control. Animals with an anxious temperament or who experience chronic stress tend to be more on edge, and negative emotions can be easily triggered by seemingly irrelevant or minor events. Interestingly, a recent study found that young horses showed larger swings in emotions than older horses in response in response to novel objects.² Controlling mood swings caused by anxiety requires identifying and eliminating the sources of stress from the environment.
Hormones are known to play a role in controlling emotions and managing stress. They’re often blamed when a mare is moody, but much more is known about how hormones act on equine reproductive behavior than about how they affect emotions. Hormonal irregularities, including abnormal levels of thyroid and adrenal hormones, can cause fluctuations in emotions. In humans, disruptions in daily activity can also lead to hormonal imbalances and increase the risk of mood disorders, including depression, bipolar disorder, and seasonal affective disorder. It’s possible that disturbed routines also cause hormonal imbalances and moodiness in some horses. Sticking to a predictable routine by structuring activities at the same time every day can help maintain normal daily hormonal balance and stabilize mood.
Disrupted sleep is closely linked to mood and anxiety disorders in humans, and when deprived of rapid eye movement (REM) sleep, people often become sad and irritable. Horses also suffer from sleep deprivation if they get less than 60 minutes of REM sleep a day, on average, for about a week. This can happen if the horse is unable to lay down in a laterally recumbent position, because of physical discomfort, insufficient space, insecurity about the environment, or social pressure.³ A horse deprived of REM sleep will become visibly drowsy, but it isn’t known if sleep disturbances are linked to negative moods in horses as they are in people.
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