Preventing and Managing Ear Mites in Horses

Ear mites in horses sound dramatic and feel even worse to the horse, but in the UK they are uncommon, and, when they do occur, treatable. The mite most often blamed is Psoroptes cuniculi, a non-burrowing surface mite that lives in the outer ear canal and causes intense itching, head shaking and ear sensitivity. Spring and early summer are the peak months for ear-related complaints in British yards, and many of the cases owners suspect to be ear mites in horses turn out to be flies, midges or sweet itch. This guide covers what ear mites actually are, how to tell them apart from lookalike conditions, the treatments your vet will reach for in 2026, and the day-to-day ear care that keeps the problem from happening in the first place.

What Are Ear Mites in Horses?

The term “ear mites” in horses almost always refers to Psoroptes cuniculi, a surface-dwelling, non-burrowing mite. Unlike sarcoptic mange (the equine equivalent of scabies), which tunnels into skin, Psoroptes grazes on the surface of the ear canal and causes inflammation, scab formation and intense pruritus (itching) without burrowing. It belongs to the same broad group as the other fleas and mites that infest horses.

The full lifecycle takes around 10 to 12 days and is completed entirely on the host. Off-host survival is short, usually a few days at most, but enough to allow transmission via shared rugs, headcollars, brushes and stables.

How Common Are Ear Mites in the UK?

Genuine ear mite infestations are rare in British horses. Petplan Equine and the BHS both note that ear mites are “very unusual” in UK horses, and a long-running Horse & Hound veterinary column (still cited today) opens with “it is very rare for mites to be found within horses’ ears.” The vast majority of cases owners present to vets, head shaking, ear scratching, scabby ears in summer, turn out to be biting flies, Culicoides midges (the cause of sweet itch), or simple sunburn on white-marked ears. Several of these overlap with the wider family of common horse skin diseases seen each summer.

That said, when they do occur, ear mite outbreaks tend to spread quickly within a yard because horses share kit, scratch on the same gateposts and groom each other. Any genuine positive should prompt a yard-wide check.

How Horses Catch Ear Mites

Routes of infestation include:

• Direct contact with an infested horse, particularly during mutual grooming.
• Shared headcollars, bridles, fly fringes and ear bonnets.
• Shared brushes and grooming kits.
• Shared stabling and stalls within the short off-host survival window.
• Cross-species transfer from rabbits or, occasionally, sheep on the same premises. Psoroptes cuniculi is the same species that affects rabbits.

Symptoms of Ear Mites in Horses

Look for a cluster of these signs:

• Intense ear scratching on fence posts, against legs, with hind feet.
• Head shaking, not just at flies, but persistent, lateral or rotary head shaking when handled.
• Drooping ear, the affected ear hangs lower than its pair, reflecting an inflamed, painful canal. Learning to read normal equine ear posture and body language makes this easier to spot early.
• Ear sensitivity, the horse pulls away from bridling, pins ears flat or becomes head-shy.
• Scabs and crusty material in the ear canal, sometimes a dry, flaky discharge.
• Hair loss at the base of the ear from rubbing.
• Secondary bacterial infection, foul-smelling discharge in longstanding cases.
• Behavioural change, an otherwise sweet horse becomes irritable, particularly during handling around the head.

Conditions Mistaken for Ear Mites

Far more common UK causes of similar signs:

• Black flies (Simulium) and biting midges (Culicoides): cluster on the inside of the ear, leaving tiny bloody scabs and hot, sore tissue. Peak season May to September. Our guide on how to treat a horsefly bite covers the soothing and protection steps.
• Sweet itch: hypersensitivity to Culicoides midges, often including the ears as well as mane and tail. Worse at dawn and dusk.
• Sunburn on white or pink-skinned ear tips, flaky, sore, sensitive in bright UK summers.
• Aural plaques in horses: whitish, raised, papilloma-like patches inside the ear caused by a papillomavirus, transmitted by black flies. They look unsightly but are rarely painful unless touched.
• Headshaking syndrome: a complex neurological condition often triggered by sunlight, with no ear-canal pathology at all. See our full guide to headshaking in horses.
• Lice or mange: heavier lice burdens and sarcoptic mange both cause rubbing and scabbing that can be mistaken for an ear problem.
• Foreign body: grass seeds and small twigs occasionally lodge in an ear, producing one-sided head shaking.

How Vets Diagnose Ear Mites

Diagnosis is straightforward in theory and tricky in practice. The horse rarely allows a torch and otoscope into a sore ear without sedation, so most UK ambulatory vets will:

• Take a full history, including yard outbreaks, recent kit-sharing and exposure to rabbits.
• Examine the ear externally for swelling, discharge and scabs.
• Sedate the horse (typically with detomidine or romifidine) for a thorough otoscopic examination.
• Take swabs and skin scrapings of the ear canal for cytology and microscopy, mites are visible under low-power microscopy.
• Rule out foreign bodies, secondary bacterial infection (with culture if needed) and aural plaques.

Mites can be hard to find because they retreat deep into the canal. The MSD Veterinary Manual notes that some horses carry psoroptic mites with no signs at all, so a negative scrape on a clinically convincing case may still warrant a treatment trial.

Treatment Options for Ear Mites in Horses

Treatment combines killing the mites, soothing the ear and preventing reinfestation. No product is licensed in the UK specifically for ear mites in horses, so vets prescribe off-label using the cascade. Standard approaches:

Ivermectin and Moxidectin Protocols

Macrocyclic lactone wormers are the cornerstone of treatment. Because this is off-label use, the dose is the horse’s routine worming dose rather than anything set by an ear-mite licence, and it is a prescription-only medicine your vet supplies and directs:

• Oral ivermectin at the standard equine worming dose of 200 mcg/kg bodyweight – the oral dose used in horses in the published pharmacokinetic work (Gokbulut, Nolan and McKellar, Equine Veterinary Journal 2001;33:494-498). A single dose does not kill mite eggs, so a repeat course is usually needed to catch the next generation; how many doses and how far apart is your vet’s call on the individual case, not a fixed protocol.
• Oral moxidectin (e.g. Equest) as an alternative; longer activity in tissue, sometimes preferred for difficult cases.

This is identical to the approach used for routine roundworm and bot fly control, so a horse on a sensible equine worming programme already has some background protection against ear mites.

Topical Treatments

Vets may add:

• Mineral oil ear drops, gently flushes the canal, smothers mites and softens scabs.
• Off-label fipronil sprays in mild cases (with caution and only on vet instruction).
• Selamectin (Stronghold) topically, licensed in dogs and cats, used off-label in some equine cases.
• Anti-inflammatory ointments (corticosteroid-based) for severely inflamed ears.
• Antibiotic ointment if secondary bacterial infection is present.

Forcing fluids deep into a horse’s ear is not safe to do at home. UK vets generally sedate the horse for the first treatment, demonstrate the technique, and dispense a take-home protocol.

Home Remedies: What Works and What Does Not

The internet is awash with home remedies for horse ear mites. The honest assessment:

• Plain mineral oil: safe, mildly effective, useful as part of a vet-supervised plan for softening scabs. Insufficient on its own.
• Coconut oil, olive oil: probably no better than mineral oil; not evidenced.
• Tea tree oil, neem oil, garlic preparations: sometimes irritating, occasionally toxic, generally inadvisable in a sensitive ear canal.
• White vinegar diluted in water: stings inflamed tissue; risks acidic damage.
• Hydrogen peroxide: damages ear-canal epithelium; do not use.
• Permethrin or pyrethroid sprays labelled for fly control: not licensed for inside the ear; can cause irritation if applied directly.

The general rule: anything you would not put in your own ear should not go in your horse’s ear. Phone the vet, get a diagnosis, and use a prescribed treatment. The £80 visit fee saves weeks of mismanagement.

Preventing Ear Mites

• Do not share headcollars, bridles, fly fringes, ear bonnets or grooming kit between horses on the yard, especially if any horse is symptomatic.
• Wash and disinfect tack regularly; submerging fly fringes in hot soapy water and air-drying in sunlight kills surface mites.
• Worm to a sensible UK protocol that includes ivermectin or moxidectin at appropriate intervals, with faecal egg counts in spring and summer and targeted strategic dosing in autumn. Our equine worming guide explains how to build one.
• Treat all in-contact horses if a positive diagnosis is made, treating one and leaving its field-mates means rapid reinfestation.
• Keep rabbits and rabbit hutches away from horse stables; Psoroptes cuniculi is the same species and crosses between hosts.
• Use a quality fly fringe or fly mask with ear covers from May to September to keep biting flies and midges out of the ear, which also reduces sweet itch flare-ups, even though most ear-region complaints are flies rather than mites.

A Sensible UK Ear Care Routine

Quick checks build into normal grooming:

• Look at both ears in good light during routine grooming, checking symmetry, posture, and any discharge or scabs.
• Run a hand gently down the outside of each ear, the horse should accept this calmly. Sudden head-shyness is a flag.
• Resist the urge to clean inside the ear canal with cotton buds or wipes, the horse’s ear is self-cleaning; deep cleaning damages the lining and removes protective wax.
• Trim the protective hair inside the ear opening only if absolutely necessary (some show classes used to require it; current British Showing rules generally allow ear hair to remain). The hair is there for fly defence.
• Apply a fly repellent labelled for the head and ears during fly season; products containing DEET should be applied to the outer ear only, not inside the canal.

For broader routine care, the British Horse Society health and management advice is a good UK reference to keep alongside your vet’s guidance.

When to Call the Vet

Phone the vet if:

• One ear is held lower than the other for more than a day.
• The horse becomes head-shy, head-shakes persistently, or starts rubbing the ears raw.
• You see scabs, discharge or a bad smell from one or both ears.
• You suspect a foreign body.
• Two or more horses on the yard show similar signs.
• The horse becomes unrideable in a bridle.

Can Humans or Other Animals Catch Them?

Psoroptes cuniculi is not normally a human concern; humans are not a natural host. The mite that does cross to humans from horses is Sarcoptes scabiei var. equi, the cause of equine sarcoptic mange, an entirely different, much rarer condition. Wash hands after handling a symptomatic horse, do not share grooming kit, and keep dogs and cats away from infected horses’ ears. You will find related parasite advice in our guide to preventing and treating ticks on horses.

Frequently Asked Questions

How do you treat ear mites in horses?

Combine systemic ivermectin or moxidectin (oral, vet-prescribed, with a repeat dose at 14 days) with topical mineral oil drops to soothe and smother. Treat all in-contact horses at the same time, disinfect shared tack and headcollars, and recheck at four weeks. The UK protocol is always vet-led because no product is specifically licensed for the indication in horses.

Can ear mites in horses be treated without a vet?

Not safely. Mineral oil drops and basic hygiene help, but the prescription wormers that actually clear the mites are POM-V medicines requiring a veterinary prescription. Far more importantly, most cases that look like ear mites in the UK are flies, midges or sweet itch, all of which need different treatment. An £80 visit confirming the diagnosis usually saves weeks of fruitless home-remedy attempts.

Can humans catch ear mites from horses?

The ear mite (Psoroptes cuniculi) does not normally infect humans. Standard hand washing after handling an affected horse is sufficient. The only equine mite that crosses readily to humans is the sarcoptic scabies mite (Sarcoptes scabiei var. equi), which causes a different, much rarer condition.

How long does it take to clear ear mites?

With a correct two-dose ivermectin protocol and supportive ear care, most cases are clinically clear within four to six weeks. Severe or longstanding cases with secondary bacterial infection or chronic scabbing can take 8 to 12 weeks to fully resolve. Recheck by the vet at four weeks to confirm clearance.

Will my horse need sedation for ear treatment?

For the first treatment, almost certainly. The ear is sore, the horse is head-shy, and forcing instruments into a painful canal makes the problem worse. Once the inflammation settles, many horses tolerate further drops calmly. UK ambulatory vets carry detomidine or romifidine sedation as routine and can usually combine the first treatment with diagnosis in a single visit.