Why is my horse’s sweet itch getting worse in warm weather?

Read time: 3 minutes

Overview

Sweet itch often seems worse in warm weather because that’s when biting midges are usually most active. Heat, sweat and sun can also make already irritated skin feel itchier, so the problem can look like it’s suddenly escalating even when the underlying issue is the same.

It’s worth checking for patterns, skin damage and any changes in turnout or grooming routine. In many cases, the answer is about exposure and irritation rather than a new skin disease, but you can’t rule that out at home with certainty.

Things To Check

1. Check whether the itching is worse at dawn, dusk or in still, warm weather, when midges are often more active.

2. Look closely for rubbing, broken mane or tail hair, scabs, redness, sore patches or thickened skin.

3. Notice whether your horse is sweating more, as sweat can make already sensitive skin feel more uncomfortable.

4. Review turnout times and field location, especially if your horse is near hedges, water, muck heaps or damp areas where biting insects may be worse.

5. Check rugs, masks and any barriers for rubbing, trapped heat or gaps that might leave certain areas exposed.

6. Think about recent changes in grooming, washing, bedding, feed or routine, as these can sometimes affect skin comfort.

7. Watch for signs of discomfort such as stamping, tail swishing, head shaking, restlessness or repeated rubbing against fences and stable doors.

Common Causes

The most common reason is increased midge activity in warm weather. Sweet itch is an allergic reaction to midge bites, so when insect pressure rises, symptoms often do too.

Heat and sweat can also make the skin feel more irritated, especially if your horse is already inflamed or has been rubbing.

Wet coats, dirty skin, poor rug fit or friction from tack and rugs can add to the problem by making the area more uncomfortable.

Less commonly, another skin issue may be contributing, such as a separate allergy, infection or parasite-related irritation. These can look similar at home, which is why ongoing or changing symptoms are worth discussing with your vet.

What To Do

Start by keeping a simple note of when the itching is worst, what the weather is like and where your horse is turned out. That can help you spot a pattern.

Try to reduce insect exposure where you can. Many owners find it helps to avoid turnout at the most midge-active times, keep horses away from damp or sheltered spots, and use stable management that lowers insect pressure.

Keep the skin as clean and comfortable as possible without over-washing. Check rugs and masks for fit and rubbing, and make sure any grooming is gentle on already sore areas.

If the horse is rubbing hard enough to break the skin, or the problem is changing rather than settling, it’s sensible to get veterinary advice so you can rule out other causes and discuss longer-term management.

Products That May Help

Warm, still weather often brings more midge activity, so having a sensible summer routine can make day-to-day management easier. arlo.® collections can help support coat care and yard routines alongside your horse’s normal sweet itch management.

Horse Fly Sprays & Summer Care

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