Ear mites are among the most common parasites affecting cats and dogs worldwide—particularly in kittens, puppies, and outdoor pets. They cause intense irritation, lead to secondary infections if left untreated, and spread rapidly between animals in the same household. The good news: ear mites are highly treatable with the right products, and most pets recover fully within weeks of starting treatment.
What Are Ear Mites?
Otodectes cynotis is the scientific name for the ear mite species responsible for the vast majority of ear mite infections in dogs and cats (and occasionally rabbits and ferrets). These microscopic, eight-legged parasites live primarily in the ear canal, though they can survive briefly on skin surfaces and in the surrounding environment. They feed on ear wax, skin oils, and tissue debris—not blood—which distinguishes them from some other parasites.
The entire life cycle—from egg to adult—takes approximately three weeks. Adult female mites lay eggs in the ear canal, which hatch into larvae, then progress through two nymphal stages before becoming reproductive adults. Adult mites survive roughly two months. Because every stage of the lifecycle occurs in or around the ear, an infestation can grow quickly without treatment.
Ear mites are highly contagious between animals through direct contact. A single infected pet can rapidly spread mites to every dog and cat in the household. Humans are very rarely affected, and only transiently—Otodectes mites cannot complete their lifecycle on human skin and cause at most a temporary mild skin reaction.
Recognising Ear Mite Symptoms
The symptoms of ear mite infestation are distinctive, though they overlap with other ear conditions like yeast infections and bacterial otitis. Knowing what to look for helps you seek treatment promptly.
The most telling sign is intense ear scratching—often frantic, sometimes causing self-inflicted wounds around the ear, neck, and head. Affected pets frequently shake their heads repeatedly. When you look in the ear, you’ll typically see a dark, crumbly, coffee-ground-like discharge: this characteristic debris is a mix of dried blood, wax, mite faeces, and dead skin tissue. The ear may smell unpleasant. The ear canal often appears red and inflamed.
If you have good lighting and a magnifying glass, you may actually be able to see the mites—tiny white moving specks against the dark debris. This is easier to spot on the pinna (outer ear flap) than deep in the canal.
Untreated infestations lead to complications: aural haematoma (a blood-filled swelling of the ear flap from violent head shaking), secondary bacterial or yeast infections that require additional treatment, and in severe cases, damage to the ear canal or eardrum. Any discharge that is yellow, green, or extremely foul-smelling suggests a secondary infection and needs veterinary attention.
Diagnosis and When to See a Vet
Vets diagnose ear mites by examining ear swab material under a microscope—mites and their eggs are clearly visible at low magnification. Otoscopic examination (looking into the ear canal with a lighted scope) may also reveal movement of the mites.
It’s important to confirm the diagnosis before treating, because bacterial and yeast ear infections look similar to ear mites but require completely different treatments. Applying anti-parasitic medication to a bacterial infection delays the correct treatment and may worsen the problem. When in doubt, always get a proper diagnosis.
See a vet promptly if: the ear is very painful or swollen, there is yellow or green discharge, the pet is holding their head tilted to one side (sign of inner ear involvement), self-trauma wounds are significant, or the pet doesn’t improve within 1–2 weeks of starting treatment.
Treatment Options for Ear Mites
Treatment has become significantly easier with the development of modern systemic and spot-on parasiticides. The old approach—daily ear drops for 21+ days—has largely been replaced by more convenient options.
Single-dose or short-course topical treatments are now the standard of care. Products containing selamectin (Revolution/Stronghold), moxidectin/imidacloprid (Advantage Multi), or ivermectin applied to the skin (spot-on) provide systemic activity against mites throughout the body, including those that have temporarily migrated out of the ear. A single application resolves many infestations, though a second dose 2–4 weeks later is often recommended to catch any newly hatched mites.
In-ear treatments include products like Milbemite (milbemycin oxime) for cats and various veterinary ear drops. These treat the ear canal directly but don’t address mites on the body surface. Many vets combine an ear treatment with a systemic product for best results.
Over-the-counter ear mite treatments exist (typically containing pyrethrins) and can be effective for mild infestations, but they require daily or every-other-day application for 3–4 weeks and are less convenient than prescription options. Never use products labelled only for dogs on cats—many canine insecticides (particularly pyrethroids in high concentrations) are toxic to cats.
Critically: treat all pets in the household simultaneously, even if only one appears symptomatic. Mites spread easily and an untreated animal will immediately reinfect treated pets.
Home Care and Prevention
Clean your pet’s ears gently before starting treatment to remove the accumulated debris. Use a veterinarian-approved ear cleaner—never hydrogen peroxide, vinegar, or alcohol, which can irritate inflamed tissue. Flood the ear canal with cleaner, massage the base of the ear, then allow your pet to shake and wipe the outer ear with cotton wool. Don’t insert cotton swabs deep into the canal.
Wash your pet’s bedding in hot water. While ear mites don’t survive long off a host (typically 4–12 days), reducing environmental contamination speeds recovery and prevents reinfestation.
Prevention centres on keeping pets on regular parasite control. Many modern monthly or quarterly flea-and-tick preventatives (particularly those containing selamectin or moxidectin) also protect against ear mites. Limit contact with unknown stray animals, and check any new pets for ear mite signs before introducing them to resident animals.