CONDITION

Ear Mites

Why this matters now

Ear mite infestations occur most commonly in young animals, particularly puppies and kittens, though adults can also be affected. Animals from shelters, breeding facilities, or multi-pet environments where close contact occurs tend to be at higher risk. While ear mites themselves are rarely dangerous, the intense irritation they cause can significantly affect comfort and quality of life.

Initial infestation may produce mild irritation that progresses to intense scratching as mite populations grow. The characteristic dark, crumbly discharge accumulates over days to weeks. Without treatment, chronic inflammation can lead to secondary bacterial or yeast infections, and some animals develop hematomas from violent head shaking or scratching.

Signals & patterns

Early signals

Head shaking

Frequent or vigorous shaking of the head as the animal attempts to dislodge the irritating mites.

Ear scratching

Repetitive scratching at or around the ears, often intense enough to cause hair loss or excoriation behind the ear.

Dark, crumbly ear discharge

A characteristic dark brown to black, dry, coffee-ground-like material accumulates in the ear canal.

Ear sensitivity when touched

Animals may flinch, pull away, or show discomfort when their ears are handled or examined.

Later signals

Wounds from scratching

Intense scratching can create raw areas, scabs, or bleeding behind the ears or on the head.

Ear hematoma

Blood vessel rupture from violent head shaking can cause swelling of the ear flap with blood accumulation.

Secondary ear infection

Chronic inflammation and damaged skin can allow bacteria or yeast to establish, changing the discharge character and odour.

Mites spreading to other body areas

Though primarily ear dwellers, mites can sometimes be found on the head, neck, or tail base where animals curl up.

Click to read about the biological mechanisms

How this is usually investigated

Diagnosis is typically straightforward, involving examination of ear discharge and visual inspection, sometimes with otoscopy to directly visualise mites in the ear canal.

Otoscopic examination

Purpose: Using an otoscope to look into the ear canal may reveal the tiny white mites moving against the dark background of debris.
Considerations: Requires a cooperative patient and clean enough ears to visualise the canal. Mites appear as small moving white specks.

Microscopic examination of ear debris

Purpose: Placing ear discharge on a slide allows microscopic identification of mites, eggs, and various life stages.
Considerations: A definitive method that can confirm diagnosis even when mites are not visible on direct examination.

Visual inspection of discharge

Purpose: The characteristic dark, dry, crumbly discharge is highly suggestive of ear mites, particularly in young animals.
Considerations: While typical appearance supports suspicion, confirmation helps distinguish from other ear conditions that may look similar.

Response to treatment

Purpose: In some cases, improvement with appropriate mite treatment provides retrospective confirmation of the diagnosis.
Considerations: Given that many treatments are relatively low risk, trial therapy may sometimes be reasonable when suspicion is high.

Options & trade-offs

Treatment targets the mites themselves while managing secondary effects. All in-contact animals typically require treatment to prevent reinfection.

Topical ear medications

Ear drops containing miticidal agents applied directly into the ear canal can kill mites with repeated application over several weeks.

Trade-offs: Requires consistent application for the full treatment period to eliminate all life stages. Ears may need cleaning before treatment.

Systemic parasiticides

Certain spot-on treatments, oral medications, or injectable products effective against mites can treat infestations without direct ear application.

Trade-offs: Often more convenient than ear drops, particularly for animals resistant to ear handling. Some products provide protection against other parasites simultaneously.

Ear cleaning

Removing accumulated debris can improve comfort and medication penetration.

Trade-offs: Should be performed carefully to avoid pushing material deeper or damaging the ear canal. Some animals require sedation for thorough cleaning.

Treatment of all contact animals

All dogs and cats in the household typically need treatment regardless of whether they show signs.

Trade-offs: Important for preventing reinfection but means treating animals that may appear healthy. Ferrets, rabbits, and other pets may also require attention.

Common misconceptions

Misconception:

"Only young animals get ear mites"

Reality:

While puppies and kittens are most commonly affected, adult animals can certainly acquire mites through contact with infested animals.

Misconception:

"Ear mites are the only cause of dark ear discharge"

Reality:

While suggestive, similar-appearing discharge can result from yeast or bacterial infections. Microscopic examination helps distinguish between causes.

Misconception:

"Treatment of the affected animal alone is sufficient"

Reality:

Mites spread easily between animals in close contact. Treating only symptomatic animals often results in reinfection from untreated housemates.

Animals showing signs of ear irritation with characteristic dark discharge may benefit from examination to confirm ear mite involvement and rule out other ear conditions. When ear mites are present, all dogs and cats in the household typically need treatment, and the environment may warrant basic cleaning measures to reduce reinfestation risk.

Last reviewed: 24 April 2026 · Dr Alastair Greenway MRCVS