Why does my horse have dark discharge in one ear? | arlo.® Atlas
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Overview
Dark discharge in one ear is often just a build-up of wax, dirt or debris, but it can also happen when the ear is irritated or uncomfortable. Sometimes the cause is as simple as grime from turnout or grooming, but it can also be linked to ear mites, infection, a foreign body or skin irritation.
If your horse is otherwise well, start by checking the ear gently and looking for other signs such as rubbing, head shaking or sensitivity. If the discharge keeps coming back, smells bad, or the ear looks sore, it’s sensible to ask your vet for advice.
Things To Check
1. Notice whether the discharge is only in one ear or both, and whether it keeps coming back after cleaning.
2. Look for redness, swelling, scabs, broken skin or a bad smell around the ear opening.
3. Check whether your horse is head shaking, rubbing the ear, or pulling away when the area is touched.
4. Think about recent turnout, grooming, clipping or fly irritation that might have led to dirt or debris collecting in the ear.
5. See whether there is any waxy, wet, crusty or sticky material rather than just dry dark dirt.
6. Check if there are signs of flies, ticks, or other irritants near the ear and surrounding skin.
7. Make a note of any change in behaviour, appetite or comfort level, especially if the ear seems more painful than dirty.
Common Causes
The most common cause is simple wax or dirt build-up, especially after turnout, grooming or if your horse has a hairy ear and tends to collect debris.
Another common reason is mild irritation from flies, sweat, dust or skin sensitivity, which can lead to dark discharge mixed with wax and skin flakes.
Less commonly, dark discharge can be linked to ear mites, a minor infection, a foreign body or another ear problem that’s making the ear produce more debris.
What To Do
Start by gently inspecting the ear from the outside and only clean what you can see easily. Use a calm approach and avoid putting anything deep into the ear canal.
If the area just looks dirty, you can keep an eye on it and see whether it settles with routine grooming and a clean environment. If there is lots of discharge, repeated irritation or discomfort, it’s better not to keep trying to clean it yourself.
Keep a note of when it happens, what the discharge looks like and whether anything seems to trigger it. That can help your vet if the problem continues.
Related Questions
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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.