Why does my horse have discharge coming from one ear?
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Read time: 3 minutes
Overview
Discharge from one ear can be something simple, like wax, dirt or moisture, but it can also happen with irritation, infection, a scratch inside the ear or, less commonly, a foreign body. Because the ears are sensitive, it’s worth checking it calmly rather than trying to clean deeply yourself.
Things To Check
1. Look at the colour and texture of the discharge. Wax tends to be pale and sticky, while pus-like discharge is often thicker, darker or smelly.
2. Check whether the ear or head is sore when touched. Pinning the ears, head shaking or avoidance can suggest irritation or pain.
3. Look for redness, swelling, scabs, cuts or rubbing around the ear base and nearby skin.
4. Notice whether there is any head tilt, balance change or unusual behaviour, as these can point to a more serious problem.
5. Think about when it started. Recent turnout, grooming, clipping, flies or a headcollar rubbing may give a useful clue.
6. Check for signs of flies or insects around the ear, especially in warmer weather.
7. See if the discharge is only on the outside of the ear or seems to be coming from deeper inside.
8. Make a note of whether it is getting better, staying the same or worsening over a day or two.
Common Causes
The most common causes are ear wax, trapped dirt, sweat or moisture, especially after exercise, turnout or grooming. Mild skin irritation or a small scratch can also lead to a bit of discharge.
Less commonly, discharge can be linked to an ear infection, a foreign body such as a grass seed, or a reaction to flies, rubbing or another source of irritation. If the ear is painful, swollen or the horse is head shaking a lot, it’s more likely to need veterinary attention.
What To Do
Start by observing rather than digging around in the ear. Gently wipe away discharge you can see on the outside with a clean, damp cloth, but don’t put cotton buds or anything deep into the ear canal.
Keep the horse in a clean environment and note any triggers such as flies, wet weather or tack and headcollars that may be rubbing. If the ear looks mildly dirty but not sore, monitor it closely for changes in amount, smell, colour or comfort.
When To Contact A Vet
Contact your vet if the discharge is smelly, bloody, thick, persistent, or if the ear is painful, swollen or hot. You should also get advice if your horse is head shaking, tilted, unsteady, has a marked change in behaviour, or if the problem does not settle quickly.
Ear problems can be awkward to assess at home, and your vet can check whether the discharge is coming from the ear canal, the skin around it, or somewhere else.
Related Questions
Why is my horse shaking its head a lot?
How do I tell wax from discharge in a horse’s ear?
Can flies cause ear irritation in horses?
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.