Sweet Itch in Horses

Causes and relief for this seasonal skin condition

Quick Answer

Sweet itch is an allergic reaction to the saliva of biting midges
It’s seasonal, typically worse from spring through to autumn
The main sign is intense itching, often at the mane and tail base
Management focuses on reducing midge exposure rather than a single cure

Signs of Sweet Itch

Intense rubbing or scratching, usually at the mane and tail base
Broken, thinning, or missing hair in these areas
Small bumps, crusting, or sores from repeated rubbing
Restlessness, especially around dawn and dusk when midges are most active
Symptoms that ease over winter and return the following spring

What’s Actually Happening

Sweet itch is an allergic hypersensitivity to the saliva of Culicoides midges. Some horses develop a strong immune reaction to each bite, leading to intense itching well beyond the bite site itself.

It tends to run in certain bloodlines and can affect horses and ponies of any breed, though some are more prone than others.

Managing Sweet Itch

Use a sweet itch rug that covers the mane, tail, and belly to physically block midge access.
Stable during peak midge hours, typically dawn and dusk in warmer months.
Apply fly repellent regularly, particularly to the mane, tail base, and belly.
Use fans in stabling — midges are weak fliers and struggle in moving air.
Avoid grazing near stagnant water, where midges tend to breed in higher numbers.
Keep skin clean to reduce the risk of secondary infection from broken skin.

Avoid

Don’t Do This

Don’t apply undiluted essential oils or unproven home remedies directly to broken skin
Don’t ignore worsening sores — broken skin is at higher risk of secondary infection
Don’t assume one product will work for every horse — management is often a combination of approaches

When to Contact Your Vet

Sores that look infected — swollen, weeping, or hot to the touch
Itching severe enough to disrupt grazing, sleep, or general behaviour
No improvement despite consistent management efforts
You’d like a tailored management plan for a newly affected horse

How Pet Med Direct Can Help

Pet Med Direct stocks fly repellents, soothing skin products, and sweet itch rugs to support a consistent management routine through the midge season.

Some treatments require a valid veterinary prescription. Pet Med Direct can only supply prescription medicines after the prescription has been checked. Always follow your vet’s advice and the directions on the product label.

Frequently Asked Questions

Does sweet itch go away on its own?

Symptoms typically ease over winter once midge activity drops, but the underlying sensitivity usually returns each year. Most horses need ongoing seasonal management rather than a one-off fix.

Can sweet itch develop later in life?

Yes — some horses don’t show signs until they’re a few years old, even if they’ve grazed the same fields for years beforehand.

Are some horses more prone to sweet itch?

Certain breeds and bloodlines do appear more predisposed, but any horse or pony can potentially develop it.

Will moving yards help?

Reducing exposure to standing water and boggy ground, where midges breed, can help, but most horses still need a combined management approach wherever they’re kept.

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This this article is for informational purposes only and does not constitute veterinary advice.
If you are concerned with your dog’s health, please consult a qualified veterinarian.