Ear Mites in Cats: The Coffee Ground Clue Vets Look For

In this guide

A dark, crumbly discharge in your cat's ears is one of the more distinctive parasite signs there is, and it is easy to spot once you know what to look for.

Of all the parasites that trouble cats, ear mites are among the easiest to recognise once you know the signs, and among the most contagious between animals living in the same house. Kittens and cats that have recently spent time around other cats, whether in a shelter, a street colony or a boarding facility, are particularly at risk.

What Are Ear Mites?

Ear mites, known scientifically as Otodectes cynotis, are tiny surface parasites that live in the ear canal and feed on skin oils and debris. They are barely visible to the naked eye, sometimes appearing as faint white specks moving against dark ear wax, but the irritation they cause is anything but subtle.

Signs to Watch For

• A dark brown or black, crumbly discharge that resembles coffee grounds
• Frequent scratching at the ears
• Head shaking or tilting
• Redness or visible irritation inside the ear flap
• A strong or unpleasant odour from the ears

Left untreated, the constant scratching and head shaking can break the skin and lead to a secondary bacterial or fungal infection, and in severe or prolonged cases can even contribute to damage inside the ear canal. None of this is common with prompt treatment, but it is a good reason not to ignore ear symptoms in the hope they resolve on their own.

How Cats Catch Ear Mites

Ear mites spread through direct contact with an infested animal. They cannot fly or jump, but they crawl readily from one cat to another, or between cats and dogs, during grooming, play or simply resting close together. This is why multi-cat households and street cat colonies see such high rates of infestation, and why an entire household of pets usually needs treatment together, even if only one animal is showing symptoms.

Getting a Proper Diagnosis

Because ear mites, bacterial infections and yeast infections can look fairly similar from the outside, a vet visit for a proper diagnosis is worth it rather than guessing. Vets typically examine a sample of the ear discharge under a microscope or with an otoscope to confirm mites are actually present before prescribing treatment.

Treatment

The good news is that ear mites are highly treatable. Your vet will usually clean the ear thoroughly to remove built-up debris, then prescribe an antiparasitic treatment, commonly topical ear drops, though some modern flea and parasite preventives applied to the skin are also effective against ear mites with a single dose. Treatment is generally continued for a few weeks to catch mites at every stage of their life cycle, and all pets in the household are usually treated together to prevent reinfection, even if some show no symptoms at all.

Prevention

Routine ear checks, especially in kittens and cats with any street or shelter background, help catch ear mites early. If you bring a new cat home, it is sensible to have them checked before introducing them to resident pets, and to keep a close eye on shared bedding and grooming behaviour in the weeks that follow.

Ear mites are not considered a risk to humans, so there is no need to worry on that front, though it is still good practice to wash your hands after handling an infested cat's ears or bedding. At home, check ears by gently lifting the flap and looking inside in good light, comparing one ear with the other for colour and odour. Avoid pushing cotton buds down into the ear canal, since this can pack debris further in or injure the ear. If you see dark discharge or your cat resists having its ears looked at, that is your cue to book a vet visit rather than attempt to clean it out yourself.

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