Why is my horse twitching or flicking its skin constantly in summer?
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Overview
If your horse is twitching, flicking its skin or seeming extra jumpy in summer, the most common reason is fly or midge irritation. Horses often react by stamping, tail swishing, skin twitching or trying to bite and rub at itchy spots. It can also be linked to sweat, coat irritation or skin sensitivity, so it’s worth checking the pattern rather than assuming it’s just flies.
Things To Check
1. Notice when it happens most, such as at turnout, near water, after exercise or during certain times of day.
2. Look closely for flies, midges or biting insects around the face, belly, legs, mane, tail and ears.
3. Check for signs of irritation such as rubbing, stamping, tail swishing, head shaking, hives, redness or small scabs.
4. Feel for heat, swelling or areas where the skin seems sore or sensitive to touch.
5. See whether the coat is sweaty, dusty, muddy or sticky, as these can make skin feel more uncomfortable.
6. Check rugs, headcollars, tack and grooming areas for rubbing or trapped dirt that could be adding to the problem.
7. Note whether any new feed, bedding, turnout field or grooming product has been introduced recently.
Common Causes
The most common cause is fly or midge bites, especially on hot, still days or around dusk. Some horses are simply more reactive than others, so they may flick their skin constantly even with only a small number of insects around.
Another common cause is summer skin irritation from sweat, dust, muddy turnout or a rough coat. This can make a horse feel itchy and more likely to twitch, stamp or rub.
Less commonly, the horse may be reacting to a skin sensitivity, hives, rubbing from tack or an early skin problem that needs closer attention. If the behaviour is new, severe or not settling, it’s sensible to keep watching for other changes.
What To Do
Start by checking whether the horse can get some relief from insects, for example by changing turnout times, reducing time in peak fly hours and keeping the coat as clean and comfortable as practical.
Keep an eye on the skin for worsening redness, broken skin or signs of rubbing. If the horse is very uncomfortable, record when it happens, where on the body it’s worst and what seems to make it better or worse.
Regular grooming can help you spot changes early, but avoid overdoing it if the skin already feels sore. Keeping the stable, turnout area and kit clean may also help reduce irritation from flies, dirt and sweat.
When To Contact A Vet
Contact your vet if the twitching is accompanied by swelling, broken skin, marked discomfort, head shaking, hives, lethargy or anything that seems to be getting worse. You should also seek advice if the horse is rubbing so much that the skin is damaged or if the behaviour is persistent and out of character.
Products That May Help
For horses that seem especially bothered by summer insects, a few items from this collection may be useful as part of your normal fly-season routine and grooming setup.
Horse Fly Sprays & Summer Care
Related Questions
Why is my horse stamping its feet in summer?
Why is my horse rubbing its mane or tail?
How can I make fly season more comfortable for my horse?
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.