08/09/2025
Eye tension in the horse.
The horse’s eyes tell us a lot about their emotional state.
Eye tension is a pretty clear indicator of stress if you know what to look for.
In the top photo, this mare was worried and holding a lot of tension.
Even without seeing the rest of her face, this is very apparently in the eye.
The eye lid is pulled up into a triangulated “peak” and her eye is widened, exposing some of the sclera, also known as a “whale eye.”
In contrast, in the bottom photo of the same horse, you can see that her upper eye lid is soft and rounded and her eye is not widened.
Eye lid tension is one of the first indicators you will see of horse’s having an increase of stress.
It can vary in intensity, with low grade stress resulting in slight tension of the lid and a less extreme “peak.”
But if you start to take notice of the subtle changes in your horse’s face throughout different moments, it can help clue you in to when they’re becoming stressed BEFORE they have a big reaction.
It allows you to help your horse regulate sooner, before the stress spirals to a point where it’s much harder to relax from.
Eye lid tension can be present for fleeting moments when horses see stressors that cause anxiety, for example, looking at a new object they haven’t seen before, seeing something in the distance they’re unsure of, hearing a scary noise etc…
But it can also be present due to chronic pain, anxiety or discomfort and in that case it’ll be seen far more often.
It can also be telling if you notice your horse repeatedly becoming tense in the eye following certain stimuli, such as seeing you approach with their saddle or when standing at the mounting block.
All of this is valuable information that can help you to decipher how your horse might be feeling so that you can start to help them relax more.
Stress is a part of life but humans have a major role in ensuring that horses are not living in a state of sustained chronic stress or being put into unnecessarily high levels of stress during training.
We have a responsibility to train kindly and be conscious of our horse’s emotional state. Doing so will also keep us safer by noticing stress before it explodes.
Understanding the subtle signs of equine stress will keep humans safer when working with horses and will also improve horse welfare.