What causes my horse to react badly to midges? | arlo.® Atlas
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Overview
Most horses that react badly to midges are responding to irritation from bites, skin sensitivity, or the way the horse’s coat and skin are reacting in warm, damp fly season conditions. In some horses, this can look like stamping, tail swishing, rubbing, head tossing or restlessness. It doesn’t always mean anything serious, but it does usually mean something is making them uncomfortable.
Things To Check
1. Check whether the reaction starts at dawn, dusk, after turnout, or in still, damp weather when midges are usually worse.
2. Look closely for bite marks, broken skin, rubbing, scabs, crusting, redness or hair loss, especially around the mane, tail, belly and face.
3. Notice whether your horse is reacting to one area more than another, as that can point to local irritation rather than general discomfort.
4. Check for sweating, a dirty coat, or damp patches, as these can make midges and skin irritation more noticeable.
5. Think about any recent changes in turnout, stable routine, bedding, feed, grooming or washing that might have affected the skin.
6. Watch for signs of repeated rubbing, such as mane thinning, tail breakage or sore patches on the face and underside.
7. If the horse is very bothered, check whether other horses nearby seem less affected, as individual sensitivity can vary a lot.
Common Causes
The most common reason is simple bite irritation. Some horses are much more bothered by midge bites than others, even when the exposure looks similar.
Skin sensitivity is another common cause. Horses with fine skin, previous irritation, or a tendency to itch may react more strongly and start rubbing or stamping.
Seasonal allergies or sweet itch-type sensitivity can also make midge season much harder to cope with. This often shows up as persistent itching, tail rubbing, mane rubbing or sore skin that keeps coming back.
Less commonly, the horse may have another skin problem at the same time, such as a coat issue, minor scurf, or a reaction to sweat, mud or grooming products that makes the skin more reactive.
What To Do
Start by reducing exposure where you can. Many owners find it helps to avoid turnout at peak midge times, keep the horse moving where possible, and use the most sheltered part of the field or yard.
Keep an eye on the skin every day during fly season so you can spot early rubbing or broken skin before it gets worse. A short daily check of the mane, tail, belly and face is often enough.
Regular grooming can help you spot changes early, but keep it gentle if the skin is already sore. If the coat is sweaty or dirty, a sensible wash routine may help with comfort, but avoid over-washing if the skin seems dry or reactive.
If your horse has a repeat pattern every summer, it’s worth making a simple note of when it starts, what areas are affected and what seems to make it better or worse. That can help you manage the pattern more confidently next time.
If the reaction is getting stronger, the skin looks sore, or the horse is making a lot of effort to rub, speak to your vet for advice, as some horses need a tailored plan.
Related Questions
Is my horse’s tail swishing a sign of midges?
How can I tell if my horse has sweet itch?
What can I do if my horse keeps rubbing its mane?
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.