Ear Mites in Dogs: Signs, Treatment and Stopping the Spread

What it usually means

Ear mites in dogs are almost always Otodectes cynotis, a mite related to spiders and ticks that lives on the surface of the ear canal and feeds on skin debris and ear wax. VCA explains that the full cycle from egg to adult takes about three weeks, and adults live about two months, laying eggs all the while. That is why a mild case can build quickly into a heavy one.

Mites spread by direct contact, so dogs usually catch them from another dog or, very often, from a cat or kitten in the same household. Puppies, shelter dogs and pets that are not on a year-round parasite preventive are affected most. Dark ear debris is not proof of mites, however. Yeast and bacterial ear infections, allergies and foreign bodies can produce similar discharge, and they are more common in adult dogs than mites are.

Signs of ear mites in dogs

The classic signs are frequent head shaking, scratching at the ears, rubbing the head on the floor or furniture, and a dry, dark brown or reddish crumbly discharge in the ear canal. The ears may smell, look red, and develop scabs or hair loss around the base from scratching. Some dogs hold an ear flap lower than usual.

Heavy infestations can spill beyond the ears onto the neck, rump and tail. Constant shaking can burst a small blood vessel in the ear flap and cause an aural hematoma, a soft, swollen, fluid-filled ear flap. Left untreated, mites can lead to secondary infection, damage to the eardrum and, in the long run, hearing problems.

When to call your vet today

Book an appointment within a day or two if your dog is shaking its head or scratching its ears often, if you see dark debris, or if the ears smell or look red. Call sooner if a puppy or a newly adopted pet is affected, or if other animals in the house have started scratching their ears too.

See your vet the same day if an ear flap suddenly puffs up like a pillow, if the ear is very painful and your dog will not let you touch it, or if you see pus or blood. These suggest a hematoma or a deeper infection that needs more than mite treatment.

When it's an emergency

Ear mites alone are not an emergency, but some ear signs are. Go to your vet or an emergency vet immediately if your dog suddenly develops a head tilt, loses its balance, walks in circles, has flicking eye movements, or falls over. These can mean the middle or inner ear is involved, or that a different nervous system problem is the cause.

Sudden severe pain, crying when the head is touched, or facial drooping on one side also needs same-day care. Do not put anything into an ear you suspect has a damaged eardrum.

What you can safely do at home

Until your dog is seen, keep it away from other pets as much as you can, wash bedding in hot water, and stop it scratching the ears raw if possible. A soft cone can help a dog that is causing wounds. Check your cats and any other animals for head shaking or ear debris and mention them to your vet.

Avoid home remedies. Oils, vinegar, hydrogen peroxide and alcohol do not reliably kill mites and can sting inflamed or broken skin, and some over-the-counter products are not suitable for every pet. Do not use cotton swabs deep in the canal, which push debris further down. Your vet will choose a treatment that is safe for your dog and the other animals at home.

What the vet will likely check

Your vet will examine both ears with an otoscope, where moving white mites can sometimes be seen, and look at a sample of the discharge under the microscope to find mites or their eggs. The same sample shows whether yeast or bacteria are present. Very sore ears may need sedation for a proper look and a thorough clean.

Treatment usually starts with cleaning out the debris, followed by a prescription ear medicine or a whole-body parasite product, often over two to four weeks. Because treatments kill adult and larval mites but not eggs, the course has to outlast the life cycle, and a recheck is commonly recommended. The AKC advises treating all the dogs and cats in the household, even those without signs, or the mites simply pass back and forth.

Prevention

Many monthly parasite preventives also protect against ear mites, so ask your vet whether the product your pets use covers them and keep every animal in the home on it year-round. Quarantine and check new pets, especially kittens and rescue animals, before they share bedding or play closely with your dog.

Routine ear checks help you catch problems early: healthy ears are pale pink, mostly clean and do not smell. Dry the ears after baths and swimming, wash bedding regularly, and book a vet visit at the first sign of debris rather than waiting for a heavy infestation.

This page is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your pet.