A dog ear infection rarely stays quiet for long. One day your dog is fine, and the next they're shaking their head, pawing at one ear, or trailing a sour smell behind them. Catching the symptoms early matters: ear infections are painful, they tend to worsen fast, and left alone they can damage the ear canal or eardrum. This guide walks through every dog ear infection symptom to watch for, how to tell an outer infection from a more serious inner one, what's driving the problem, and how to support your dog's ears so flare-ups become rarer.
The Most Common Dog Ear Infection Symptoms
Ear infections (otitis) usually announce themselves with a recognizable cluster of signs. The more of these you notice, the more likely an infection is brewing:
- Head shaking and tilting — often the very first thing owners spot.
- Scratching or pawing at one ear, sometimes hard enough to cause scabs or hair loss around the ear base.
- A noticeable odour — a sweet, musty, "corn-chip" smell usually points to yeast, while a sharper, fouler smell leans bacterial.
- Discharge in the canal — brown and waxy (yeast), or yellow-green and pus-like (bacterial).
- Redness, swelling, and warmth inside the ear flap and canal.
- Tenderness or pain when you touch the ear, sometimes with whining or pulling away.
- Rubbing the head along furniture or the floor for relief.
- A greasy or crusty look to the fur around the ear.
If your dog also seems generally itchy elsewhere, the ears may be just one symptom of a wider skin issue — our guide to why dogs scratch their ears non-stop covers the overlap.
Outer Ear vs. Inner Ear Infection Symptoms
Most ear infections start in the outer canal (otitis externa) and are uncomfortable but manageable. When an infection moves deeper into the middle or inner ear (otitis media or interna), the symptoms change — and the urgency rises sharply.
Outer ear infection (otitis externa)
This is the common form: head-shaking, scratching, odour, discharge, and redness confined to the visible canal and ear flap. Caught early, it often responds well to cleaning and targeted treatment.
Inner ear infection (otitis media / interna)
Deeper infections produce neurological-type signs that go beyond simple itching:
- Head tilt held persistently to one side.
- Loss of balance, stumbling, or circling.
- Rapid, flicking eye movements (nystagmus).
- Reluctance to chew or open the mouth, and sometimes facial drooping.
These signs mean a same-day veterinary visit. Inner ear infections can affect hearing and balance, and in rare, severe cases an untreated deep infection can spread further — which is exactly why early outer-ear symptoms shouldn't be ignored.
What Causes Dog Ear Infections?
An ear infection is almost always a symptom of something else tipping the ear out of balance. The usual drivers include:
- Allergies — environmental and food allergies are the number-one underlying cause of recurring ear infections, because they inflame the canal lining.
- Trapped moisture after swimming, baths, or rainy walks — warm, damp canals are ideal for yeast and bacteria.
- Ear anatomy — floppy-eared and hairy-canalled breeds (Cocker Spaniels, Basset Hounds, Labradoodles, Golden Retrievers) trap heat and humidity.
- Ear mites — more common in puppies, producing a dark, coffee-ground discharge and intense itching.
- Wax buildup or foreign material such as grass seeds.
- A recent course of antibiotics, which can disrupt the skin and gut microbiome.
Because yeast (Malassezia pachydermatis) is behind so many canine ear infections, knowing whether you're dealing with yeast or bacteria changes the plan — our breakdown of a yeast infection in dogs' ears explains how to tell them apart.
What to Do When You Spot the Symptoms
If the symptoms are mild and confined to the outer ear, a gentle, consistent routine helps while you confirm the cause:
- Clean and dry the ear. Use a vet-appropriate ear cleaner, massage the base, let your dog shake, then wipe the visible canal — never push a cotton swab deep inside. Our step-by-step ear-cleaning guide shows the safe technique.
- Treat the infection at the source. For active yeast or mild infections, targeted drops deliver actives right into the canal — see our guide to antifungal ear drops for dogs.
- Support the ears from the inside. Because recurring infections so often trace back to allergies and the gut–skin axis, inside-out support matters. Our Yeast Infection Drops combine antifungal botanicals (caprylic acid, oregano carvacrol, berberine, Pau D'Arco), a Saccharomyces boulardii postbiotic, and skin-barrier nutrients to help support a balanced gut–skin axis alongside your vet's care. You'll find it in our yeast relief collection.
Inside-out support complements — it doesn't replace — cleaning, vet treatment, and managing the underlying allergy. Learn more about our approach on the Pure Majesty Pets homepage.
When to See Your Veterinarian
Book a visit if your dog is in obvious pain, if the ear is bleeding or has open sores, if there's a head tilt, stumbling, or loss of balance, if the discharge is yellow-green and pus-like, or if symptoms don't improve within a few days of gentle home care. A quick swab under the microscope (cytology) tells your vet whether it's yeast, bacteria, mites, or a mix — and it confirms the eardrum is intact before any drops go in.
Frequently Asked Questions
What are the first signs of an ear infection in dogs?
The earliest signs are usually head-shaking, scratching at one ear, and a faint musty or sour odour. Redness inside the ear flap and a brown or waxy discharge often follow within a day or two.
Can a dog ear infection go away on its own?
Occasionally a very mild case settles, but most ear infections worsen without care because the underlying trigger — usually allergies, moisture, or yeast — is still present. Early treatment prevents a painful, harder-to-clear infection.
How can I tell if it's a yeast or bacterial ear infection?
Yeast typically causes a brown, waxy discharge and a sweet, musty smell, while bacterial infections more often bring yellow-green pus and a sharper odour. Only cytology at your vet can confirm which — or both — your dog has.
Is a dog ear infection an emergency?
An outer ear infection is uncomfortable but not usually an emergency. However, a sudden head tilt, loss of balance, or rapid eye movements suggest a deeper inner-ear infection and warrant same-day veterinary attention.
Scientific References
- Saridomichelakis MN, Farmaki R, Leontides LS, Koutinas AF. Aetiology of canine otitis externa: a retrospective study of 100 cases. Veterinary Dermatology. 2007;18(5):341-347.
- Bond R, Morris DO, Guillot J, et al. Biology, diagnosis and treatment of Malassezia dermatitis in dogs and cats: WAVD Clinical Consensus Guidelines. Veterinary Dermatology. 2020;31(1):27-e4.
- Nuttall T. Successful management of otitis externa. In Practice. 2016;38(S2):17-21.
- Chen TA, Hill PB. The biology of Malassezia organisms and their ability to induce immune responses and skin disease. Veterinary Dermatology. 2005;16(1):4-26.
- Craig JM. Atopic dermatitis and the intestinal microbiota in humans and dogs. Veterinary Medicine and Science. 2016;2(2):95-105.
Always consult your veterinarian before starting a new supplement or treatment, particularly if your dog has an existing medical condition. Ear infections involving pain, discharge, or balance changes should be examined by a vet.