If your cat has been shaking their head violently, scratching at their ears constantly, or you’ve noticed a dark, crumbly discharge inside the ear canal, ear mites may be to blame. Ear mites (Otodectes cynotis) are among the most common external parasites affecting cats, and while they’re not life-threatening, they cause significant discomfort and can lead to serious complications if left untreated.
This guide covers everything cat owners need to know about ear mites in 2026 — from identifying an infestation to choosing the right treatment and keeping cats mite-free long-term.
What Are Ear Mites?
Ear mites (Otodectes cynotis) are microscopic eight-legged parasites that live primarily in the ear canal, although they can also be found on other parts of the body. They’re highly contagious between cats, dogs, rabbits, and ferrets, but they don’t infect humans in the same way — though they can cause temporary, mild itching if they migrate to a person’s skin.
Ear mites complete their entire life cycle on the host animal in approximately three weeks. They feed on ear wax, skin oils, and skin debris inside the ear canal, and their presence triggers intense inflammation and irritation. Adult mites are visible to the naked eye as tiny white dots if you look carefully inside a severely infested ear, though most are too small to spot without a magnifying tool.
Ear mites are the most common cause of otitis externa (outer ear inflammation) in cats, particularly in outdoor cats and kittens. Cats under one year of age are disproportionately affected because their immune systems are still maturing.
How Do Cats Get Ear Mites?
Ear mites are highly contagious and spread primarily through direct contact with an infected animal. A cat doesn’t need prolonged contact to pick up mites — a brief interaction with an infected cat is often enough for transfer to occur.
Direct animal-to-animal contact is the primary transmission route. Cats that go outdoors, live with other cats, or have contact with stray or feral cats are at significantly higher risk. Ear mites can crawl off one animal and onto another during play, grooming, or sleeping together.
Shared bedding, grooming tools, or bedding can harbor mites for a short period outside of a host, though mites don’t survive long in the environment without a host to feed on.
Kittens frequently acquire ear mites from their mothers — either in the nest or during nursing and grooming interactions.
Symptoms of Ear Mites in Cats
The symptoms of ear mites are hard to miss once they develop. Common signs include:
- Intense head shaking — cats shake their heads repeatedly trying to dislodge the mites
- Scratching at the ears — often vigorous enough to cause wounds around the ears and neck
- Dark, crumbly ear discharge — often described as looking like coffee grounds; this is a mixture of ear wax, blood, skin debris, and mite waste products
- Redness and inflammation inside the ear flap and canal
- Strong odor emanating from the ears
- Skin lesions on the head, neck, and outer ear from self-trauma (scratching)
- Aural hematoma — a blood-filled swelling of the ear flap caused by violent head shaking; this is a secondary complication requiring veterinary treatment
- Head tilt — in severe cases where the middle ear is affected
It’s important to note that similar symptoms can be caused by other conditions, including bacterial ear infections, yeast infections, or a foreign body in the ear canal. A veterinarian needs to examine the ear discharge under a microscope to confirm the presence of mites and rule out other causes.
Diagnosing and Treating Ear Mites in Cats
Diagnosis is typically made by a veterinarian who will use an otoscope to examine the ear canal and may swab the ear discharge and examine it under a microscope to identify the mites or their eggs.
Veterinary treatment options:
Topical spot-on treatments: Products containing selamectin (Revolution), moxidectin (Advantage Multi), or milbemycin are applied to the skin at the back of the neck. These systemic treatments are highly effective and also protect against fleas, heartworm, and some intestinal parasites. Many vets consider these the gold standard for ear mite treatment because they’re easy to apply and work systemically.
Ear drops: Prescription ear drops containing insecticides such as ivermectin, pyrethrin, or thiabendazole are applied directly into the ear canal. These are effective but may need to be used for 3–4 weeks and can be challenging to administer correctly in a struggling cat.
Single-dose injectable ivermectin: Some veterinarians use an injectable treatment for severe or hard-to-treat cases, though this is less common.
Before applying any ear treatment, the ears should be gently cleaned to remove the debris and discharge. Your vet may do this at the clinic or advise you on how to do it safely at home using a cat-safe ear cleaning solution.
Important: Treat ALL animals in the household simultaneously, even if only one pet shows symptoms. Untreated pets will reinfect treated ones. Also wash all bedding and soft furnishings, though mites don’t typically survive more than a few days off the host.
Preventing Ear Mites in Cats
Preventing ear mites is substantially easier than treating an active infestation. The most effective preventive measures include:
Year-round parasite prevention: Using a broad-spectrum monthly parasite preventative (such as Revolution or Advantage Multi) that includes coverage for ear mites greatly reduces the risk of infestation. This is particularly valuable for cats with outdoor access.
Limiting contact with unknown animals: Reducing your cat’s contact with stray, feral, or unknown cats significantly lowers exposure risk.
Regular ear inspections: Make it a habit to look inside your cat’s ears during grooming sessions. Catching a mite infestation early means treatment will be simpler and the cat will suffer less.
Treating all household pets simultaneously: In multi-pet households, if one animal is diagnosed with ear mites, treat all pets at the same time to prevent a cycle of reinfection.
Can I treat my cat’s ear mites at home without a vet?
While some over-the-counter ear mite treatments exist, a veterinary visit is strongly recommended before treating. Ear infections (bacterial or yeast) look very similar to ear mite infestations and require completely different treatments. Using ear mite medication on an infected ear can worsen a bacterial or yeast infection. A vet will confirm the diagnosis and prescribe the most effective treatment — modern prescription spot-on treatments are often more effective than OTC options and can be applied just once rather than requiring weeks of daily ear drop administration.
How long does it take to get rid of ear mites in cats?
With appropriate treatment, most ear mite infestations resolve within 3–4 weeks. Modern spot-on treatments (like Revolution) typically eliminate mites within 30 days with a single application. Traditional ear drop treatments require daily or every-other-day application for 3–4 weeks to cover the full mite life cycle and ensure eggs as well as adults are killed. Follow-up examination by your vet confirms the infestation has been fully cleared.
Can ear mites spread from my cat to me?
Ear mites very rarely cause problems in humans. Otodectes cynotis is highly host-specific to cats, dogs, and other small animals. In rare cases, mites that migrate onto human skin can cause temporary itching or a mild skin rash, but they cannot complete their life cycle on humans and will die within a few days. Good hygiene — washing hands after handling an infected pet — minimizes even this small risk. Human ear mite infestations are extremely rare and not a significant concern.
Can indoor cats get ear mites?
Yes, although indoor cats have a much lower risk than outdoor cats. Indoor cats can still get ear mites if a new pet is introduced to the household without quarantine and health screening, if a pet dog (which goes outside) brings mites in, or if the cat ever has contact with other animals. Regular use of a preventative treatment like Revolution dramatically reduces the risk even for indoor cats.
What does ear mite discharge look like in cats?
The characteristic discharge from an ear mite infestation is dark brown or black, crumbly, and dry — often compared to coffee grounds or dark granular debris. This material is a combination of ear wax, dried blood, shed skin cells, and mite waste products. It accumulates inside the ear canal and sometimes at the opening of the ear. The appearance of this distinctive “coffee ground” debris is a strong indicator of ear mites, though a vet exam is still needed to confirm the diagnosis with certainty.