Why is my horse's eye watering after a knock or scratch?
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Overview
If your horse's eye is watering after a knock or scratch, it may be a straightforward response to irritation, dust or a mild surface injury. It can also be a sign that the eye is more than just a little sore, so it’s worth checking it carefully rather than assuming it will settle on its own.
The main thing is to look for changes in the eye, the eyelids and the skin around them, and to watch for signs that your horse is uncomfortable or the problem is getting worse.
Things To Check
1. Check whether the eye is watering continuously or only now and then.
2. Look for redness, swelling, a cloudy look to the eye, or any visible scratch on the surface.
3. See if there is any discharge, especially if it is yellow, green or sticky rather than just watery.
4. Watch whether your horse is squinting, keeping the eye partly closed or rubbing at it.
5. Check the eyelids and the skin around the eye for a cut, graze, swelling or a trapped bit of debris.
6. Notice whether the horse seems more sensitive to light than usual or is reluctant to come out of shade.
7. Think about what happened before it started, such as turnout, grooming, a field knock or contact with dust, hay or bedding.
8. Check whether both eyes are affected or just one, as one-sided watering often points to a local problem.
Common Causes
A mild knock or scratch can make the eye water simply because the surface is irritated.
Dust, hay, bedding or a tiny bit of grit may also get into the eye and cause watering and blinking.
A small graze on the eyelid or around the eye can make the area sore and watery even if the eye itself looks fairly normal at first.
Sometimes the eye surface can be scratched more deeply, which can lead to squinting, redness and a watery discharge.
Less commonly, watering can be linked to a more significant eye problem, especially if there is cloudiness, marked pain or the eye is not improving.
What To Do
Keep your horse quiet and avoid any situation where the eye could be knocked again.
Do not let them rub the eye on fencing, a wall or stable fittings.
If there is loose dirt or dust on the face, you can gently clean around the outside with clean water and a soft, clean cloth, but don’t poke anything into the eye itself.
Make a note of what the eye looks like, whether the watering is getting better or worse, and whether there is any squinting or discharge.
Keep the environment as clean and dust-free as you can, especially with bedding and hay, as irritation can be worse in a dry or dusty stable.
If the eye does not quickly settle, or if anything about it looks abnormal, it’s sensible to have it checked by a vet.
When To Contact A Vet
Contact your vet promptly if the eye is painful, very red, cloudy, swollen, or your horse is holding it shut. Also get advice if there is yellow or green discharge, the eye looks injured, or the watering started after a more obvious knock and is not settling.
Eye problems can change quickly, and it’s better not to wait if the eye looks worse, your horse is distressed, or you’re unsure how serious it is.
Products That May Help
If the skin around the eye has been lightly knocked or scraped, a sensible first aid kit can help you keep the area clean and manage the outer skin while you’re monitoring the eye itself.
Related Questions
Should I flush my horse's eye if it is watering?
Why is my horse squinting after a field knock?
Can dust or bedding make a horse's eye water?
Atlas is here to support owners with practical, easy-to-understand guidance. It is not a substitute for professional veterinary advice. If you're concerned about your animal's health, symptoms worsen, or something doesn't feel right, contact your vet.