If your cat has been shaking its head and scratching at its ears more than usual, and you look inside to find dark, coffee-ground-like debris, that’s a very specific and very common picture — ear mites. They’re unpleasant for the cat but genuinely straightforward to treat once you know what you’re looking at.
Quick disclaimer: I’m a pet parent and content researcher, not a veterinarian. Ear problems can look similar to each other (mites, infections, allergies), so a vet check confirms which one you’re actually dealing with before you start treating.
What ear mites actually are
Otodectes cynotis — the ear mite — is a microscopic parasite that lives in the warm, dark environment of the ear canal. According to PetMD and Small Door Veterinary, they’re extremely common, especially in kittens, and while they don’t affect humans, they spread readily between cats, dogs, and other pets in the same household.
Signs to look for
- Head shaking and scratching at the ears — often more intense than a “normal” occasional scratch
- Dark brown or black, crumbly discharge in the ear canal, often described as looking like coffee grounds
- Drooping or held-back ears
- Visible redness or irritation inside the ear
- In more advanced cases, scabbing around the ear from repeated scratching
How contagious is this?
Very — ear mites spread quickly between cats, and can also pass to dogs and other household pets, especially in multi-pet homes or shelters. This is exactly why treatment usually isn’t limited to just the symptomatic cat.
Diagnosis and treatment
A vet typically confirms ear mites by looking at a sample of the ear discharge under a microscope — mites are visible this way, which distinguishes it clearly from a bacterial or yeast ear infection that can look superficially similar.
Treatment options include topical or systemic anti-parasitic medications — selamectin, moxidectin, ivermectin, and milbemycin are commonly used classes, per veterinary sources. Most cats show improvement within 24–48 hours of starting treatment, but it can take up to three weeks to fully clear all the mites and their eggs, and your vet may want a follow-up check to confirm the ear is truly clear. As with other parasite treatments in this section, I’m not listing doses — that’s a decision your vet makes based on your cat’s weight and the product used.
Treat every pet in the household, not just the one showing symptoms — this is standard advice because of how easily mites spread, and skipping it is one of the most common reasons an infestation seems to “come back” after treatment.
What happens if it’s left untreated
Left alone, ear mites can lead to secondary bacterial infections, significant pain, and severe inflammation in the ear canal — and in serious, prolonged cases, this can progress to eardrum rupture and hearing loss. This is why “it’s just a bit of scratching” is worth taking seriously rather than dismissing.
Cleaning and aftercare
- Follow your vet’s specific ear-cleaning instructions rather than improvising your own solution
- Don’t use cotton swabs deep in the ear canal — they can push debris further in or injure the canal
- Wash bedding and thoroughly clean areas your cat frequents, since mites can survive briefly off-host
Frequently asked questions
Can I catch ear mites from my cat?
No — Otodectes cynotis does not infest humans, though it does readily spread to other cats, dogs, and household pets.
How do I know if it’s ear mites versus a regular ear infection?
You genuinely can’t reliably tell by eye alone — both can cause scratching, head shaking, and discharge. A vet exam with a microscope check of the discharge is the only way to know for sure, which also determines the right treatment.
Do indoor-only cats get ear mites?
Yes — indoor cats can still get ear mites, usually through contact with another infested pet in the household or one that’s been outdoors, which is part of why treating every pet matters.
How long until my cat feels normal again?
Most cats are noticeably more comfortable within a couple of days of starting treatment, though full clearance of the mites can take up to three weeks — don’t stop treatment early just because the scratching has calmed down.
