Ear Infections in Dogs: Signs, Cleaning and Treatment
Why do dogs get ear infections? What head shaking, odor and discharge mean, safe home ear cleaning, how vets treat otitis, and how to prevent recurrence.
Bulut Veterinary Clinic Medical Team
Reviewed by Mücahid Çiftçioğlu, DVM
The constant head shaking, the hind paw working at an ear, that familiar sour smell when your dog leans in for a cuddle… Ear infections (otitis) are among the most common reasons dogs visit the clinic, and nearly every dog owner faces this picture at least once. The good news: caught early, most ear infections clear up quickly and without lasting damage.
The bad news is that well-meaning home remedies — deep cleaning with cotton swabs, reusing leftover medication, mixtures found on the internet — can turn a simple infection into a stubborn, painful problem. In this article we walk through how to read the signs, what happens at the clinic, how to clean ears properly at home, and how to keep infections from coming back.
Why is a dog's ear so prone to infection?
A dog's ear canal is not straight like ours; it is a long, L-shaped tunnel that first drops down and then turns horizontally. This shape shields the eardrum from injury, but it also makes it hard for moisture, wax and shed skin cells to work their way out. Warm, dark and humid, this tunnel is close to an ideal environment for microorganisms to multiply.
Some dogs carry extra risk: in floppy-eared breeds the canal stays covered and poorly ventilated; in breeds with hairy ear canals the hair traps moisture and debris; and in dogs that love water, every swim and bath carries moisture into the canal. In other words, an ear infection is rarely a 'hygiene failure' — it is usually the product of anatomy and lifestyle combined.
The signs: what is your dog trying to tell you?
Ear infections hurt, and dogs show that discomfort through behavior. If you notice one or more of the following, it is time to have the ears examined:
- Frequent head shaking, or holding the head tilted to one side
- Scratching at the ear with a paw, or rubbing the ear on the floor or furniture
- A bad smell from the ear — sour, yeasty or rotten
- Redness, swelling or warmth of the ear flap and canal opening
- Brown, yellow or black discharge; debris building up at the canal entrance
- A pain response when the ear is touched: pulling away, whining, even growling
- In advanced cases, loss of balance, circling or reduced hearing
The real question: what triggered the infection?
The bacteria and yeast found in an infected ear are usually the consequence of the problem, not its cause. A healthy ear canal hosts small numbers of these organisms all the time; when the canal's environment is disturbed, they multiply unchecked and the infection picture emerges. That is why veterinarians don't just aim to 'kill the germ' — they look for whatever disturbed the environment in the first place.
The most common triggers are allergies (food or environmental allergy is the single most important underlying cause of recurrent ear infections), ear mites (especially in puppies), moisture left in the canal after swimming or bathing, foreign material such as grass awns working into the canal, hormonal disease and, rarely, growths inside the canal. Unless the trigger is found and managed, the infection responds to treatment — and then returns.
Diagnosis at the clinic: looking from outside is not enough
During the exam the veterinarian first assesses the ear flap and canal opening, then uses an otoscope (an instrument that lights up and magnifies the canal and eardrum) to inspect the depths of the canal and check whether the eardrum is intact. The eardrum's condition is a critical piece of information, because some cleaning solutions and medications cannot be used if it is damaged. In very painful, swollen ears this assessment may be done under light sedation so the dog is not forced through it.
The second step is cytology: a sample of the discharge is examined under the microscope to determine whether the problem is bacteria, yeast, parasites — or a combination. This simple test is what allows treatment to be targeted rather than guessed. In recurrent cases or those not responding to treatment, culture and sensitivity testing (growing the organism to determine which treatment it responds to) may be needed.
Treatment and home ear cleaning: dos and don'ts
Treatment combines a professional ear cleaning at the clinic, ear drops matched to the organism involved, and supportive care for pain and inflammation where needed. The single most important rule is to finish the course: even if the signs ease within a few days, treatment must continue for as long as your veterinarian prescribed, followed by a recheck. Stopping early is the most common reason a half-suppressed, more resistant infection comes back.
For home cleaning, use only the ear cleaning solution your veterinarian recommends: fill the canal with the solution, gently massage the base of the ear for 20–30 seconds, let your dog shake their head, then wipe away the debris that surfaces — only as far as you can see, using cotton wool. Never push a cotton swab into the canal; it packs debris deeper and can injure the eardrum. Household remedies such as alcohol, hydrogen peroxide, vinegar or olive oil do nothing except add irritation and pain. It also matters not to put anything into the ear before the exam — otherwise the cytology result can be misleading.
Recurrent infections and true emergencies
An ear infection that returns several times a year is not bad luck — it is a signal, and most often the background problem is an unmanaged allergy. Working through an allergy investigation with your veterinarian is the only way to fix ear health for good. In water-loving dogs, cleaning with a vet-approved drying solution after every swim, and in floppy-eared breeds regular checks and keeping the ears dry, noticeably reduce the risk of recurrence.
Some situations should not wait for a routine appointment: a sudden pronounced head tilt, loss of balance, circling, severe pain around the ear, or a soft swelling that balloons up on the ear flap (which can be a blood pocket) all call for prompt attention. Our clinic is open 24/7; when infection advances toward the middle and inner ear, early intervention makes a real difference for hearing and balance.
Frequently asked questions
Can I clean my dog's ears with cotton swabs?
No. A cotton swab pushes debris deeper into the canal, scratches the delicate canal skin and can damage the eardrum. Proper cleaning means applying a vet-approved solution into the canal, massaging the base of the ear, letting the dog shake, and wiping away what surfaces — only from the visible part of the ear, with cotton wool.
Are ear infections contagious to other pets or to people?
Classic bacterial and yeast ear infections are not contagious; they develop from a disturbance of the animal's own ear environment. Ear mites, however, pass easily from animal to animal — if they are found, especially in puppies or multi-pet homes, the other cats and dogs in the household should be checked too.
What should I do about the ears after swimming or bathing?
Dry the ear flap and canal opening with a soft towel; for dogs that swim often or have a history of ear problems, use the drying ear solution your veterinarian recommends. During baths, placing a loose piece of cotton wool at the canal opening and removing it afterwards is a practical way to keep water out.
Can I reuse ear drops left over from a previous treatment?
Don't. This infection's organism may be different, and the wrong drops can make things worse; if the eardrum is damaged, some drops can cause serious harm. Using drops before the visit also distorts the cytology result and delays the correct diagnosis. With every new infection, the order is: examination first, then treatment.
Which dogs are most prone to ear infections?
Floppy-eared breeds, breeds with hairy or narrow ear canals, dogs that love water, and dogs with allergic skin disease are the most prone. In these dogs, regular ear checks, keeping the ears dry and managing the underlying allergy together with your veterinarian noticeably reduce how often infections occur.
Related services
If your dog is scratching an ear, shaking their head or the ear smells bad, don't wait — our clinic is open 24/7, and early examination prevents stubborn infections.
This article is for general information only and is not a substitute for a veterinary examination. Always consult your veterinarian about decisions concerning your pet's health.