Why does my horse seem stressed when flies are bad?

Read time: 3 minutes

Overview

Yes, flies and midges can definitely make a horse seem stressed. Many horses become restless, twitchy, head-shy, tail-swishing or difficult to settle when insects are bothering them. It is often down to irritation, itching, or just being unable to relax, but there can be several reasons for the reaction.

In some horses, the issue is mild and seasonal. In others, it can build up into rubbing, stamping, loss of focus or poor turnout tolerance, so it helps to check what is actually going on.

Things To Check

1. See whether the behaviour changes most when flies are active, such as warm, still days, dusk, dawn or near muck heaps and standing water.

2. Look for signs of irritation such as tail swishing, stamping, skin twitching, head tossing, rubbing or repeated shaking.

3. Check the ears, face, belly, legs and dock for redness, broken skin, scabs, damp patches or hair loss from rubbing.

4. Notice whether the horse is worse at turnout, in the stable, while being groomed, or during riding or exercise.

5. Look at the coat and skin closely for midge bites, crusting, dandruff-like flakes or areas that seem extra sensitive.

6. Check whether rugs, boots, boots straps, saddlery or grooming routines might be making the irritation feel worse.

7. Think about whether other horses nearby are also bothered, which can help show if it is mainly a fly pressure problem in the environment.

Common Causes

The most common reason is simple insect irritation. Flies and midges can make a horse feel constantly pestered, especially if the weather is warm and still or the horse is standing in an exposed area.

Some horses are more sensitive than others and may react strongly to bites or to the feeling of insects landing on them. This can look like stress, but it is often really discomfort and frustration.

If there is itching, rubbing or repeated tail swishing, the horse may also be developing sore skin from the fly season itself. Once the skin is irritated, even small amounts of insect pressure can feel much worse.

Less commonly, there may be an underlying skin issue, poor fit of rugs or tack, or another comfort problem that makes the horse less able to settle when flies are around.

What To Do

Start by reducing the horse's exposure where you can. Bring turnout forward or later in the day if that suits your routine, and use field or stable management that avoids the worst fly times when possible.

Keep an eye on the skin so you can spot rubbing or soreness early. Gentle grooming and regular checks around the face, mane, tail and belly can help you notice changes before they become more obvious.

Try to keep the environment as low-irritation as possible by managing muck, damp areas and standing water, since these can attract more insects. If the horse is especially sensitive, think about how turnout, shelter and resting areas are arranged.

If the horse is becoming noticeably distressed, restless or sore, it is worth reviewing the pattern rather than just assuming it is normal fly season behaviour. A few small changes often make the day much easier for them.

Products That May Help

Horse Fly Sprays & Summer Care may be useful as part of your horse's summer routine, especially if flies and midges seem to be making turnout, grooming or handling more uncomfortable.

Horse Fly Sprays & Summer Care

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