Why does my horse have discharge from one eye after an injury?
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Overview
If your horse has discharge from one eye after an injury, it can be a sign of irritation, a scratch to the eye, or inflammation around the eyelids and surrounding tissues. A little tearing can happen after a minor knock, but coloured, thick or ongoing discharge needs more attention.
Because the eye is delicate, it’s best not to assume it’s just a minor graze. There may be several possible causes, and some can look similar at first.
Things To Check
1. Check whether the discharge is clear and watery, or thick, yellow, green or sticky.
2. Look for squinting, blinking more than usual, keeping the eye partly closed or sensitivity to light.
3. Notice any swelling, redness, heat or obvious pain around the eye or eyelids.
4. See if there’s any visible scratch, bleeding, swelling, debris or a foreign body near the eye.
5. Check whether the eye looks cloudy, dull or different in size compared with the other side.
6. Watch for rubbing, head shaking or reluctance to be touched near the face.
7. Think about what happened before it started, such as a kick, branch strike, stable injury, dust or wind.
Common Causes
The most common reason is irritation after a minor injury, where the eye waters to flush out dirt or dust.
A scratch on the surface of the eye can also cause discharge, squinting and tearing, even if the injury looked small at the time.
Inflammation around the eyelids or a bruise to the area may lead to one-sided discharge too, especially if the horse has been rubbing the face.
Less commonly, a deeper eye injury or infection may be involved, which is why discharge after trauma should be taken seriously if it doesn’t settle quickly or the eye looks painful.
What To Do
Keep the horse calm and avoid anything that could make the eye worse, such as face rubbing, dusty bedding or bright light if they seem sensitive.
Do not try to pick at the eye or use human eye drops unless your vet has told you to. If there is dirt or loose debris on the outside of the face, you can gently clean around the area with clean cotton wool and sterile saline if needed.
Keep a close eye on whether the discharge changes, the eye closes more, or the horse becomes more uncomfortable. If the injury is recent, it’s sensible to check the eye several times a day.
Reduce dust in the stable and keep turnout and handling as calm as possible until you know the eye is settling.
When To Contact A Vet
Contact your vet promptly if the eye is painful, cloudy, very red, swollen, or the discharge is thick, coloured or getting worse. An eye injury can change quickly, and it’s safer to have it checked early.
You should also get veterinary advice if your horse is squinting, keeping the eye closed, or there’s been a direct blow, thorn, branch strike or other injury to the eye area.
Products That May Help
Keeping the area around the eye and face clean can be useful as part of your day-to-day care while you monitor the injury.
Related Questions
Why is my horse squinting after an eye injury?
How can I tell if my horse’s eye injury is serious?
What should I do if my horse rubs its eye after being hurt?
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.