Knowing how to tell if your dog has an ear infection comes down to a quick look-sniff-touch check: peer inside the ear flap for redness or discharge, smell for a yeasty or sour odor, and watch for head-shaking, scratching, or a dog that pulls away when you touch the ear. When two or more of those signs appear together, an ear infection (otitis externa) is likely — though only your veterinarian can confirm the cause with a simple ear swab. Below are the seven signs that matter most, a three-step exam you can do at home, and the red flags that mean the vet visit can't wait.
The 7 signs your dog has an ear infection
The signs of dog ear infection rarely announce themselves one at a time. The more boxes you can tick, the more confident you can be that something is wrong rather than normal wax. For the full early-warning picture, our guide to dog ear infection symptoms goes deeper on each one.
| Sign | What you'll notice | What it often means |
|---|---|---|
| Head shaking or tilting | Repeated shaking; holding the head to one side | Irritation or fluid deep in the canal |
| Scratching & pawing | Digging at the ear; rubbing it on furniture | Itch from yeast or bacterial overgrowth |
| Odor | A yeasty, musty, or sour smell | Microbial overgrowth, often Malassezia yeast |
| Discharge | Brown and waxy, or yellow-to-green material | Active infection; color hints at the cause |
| Redness & swelling | Red canal; a puffy, warm ear flap | Inflammation of the ear lining |
| Pain & heat | Flinching, whining, or a hot ear | A deeper or advanced infection |
| Behavior change | Irritability, less play, lower appetite | Ongoing discomfort |
A simple 3-step at-home ear check
You don't need an otoscope to do a useful first assessment. Pick a calm moment, use good light, and keep it gentle — never push anything into the ear canal.
1. Look
Lift the ear flap and check the visible canal. A healthy ear is pale pink with a little wax and no crusting. Warning signs: redness, a brown or yellow buildup, scabs, or hair loss around the opening.
2. Sniff
Bring your nose close. A healthy ear is nearly odorless; a strong yeasty smell (often described as "corn-chip") or a sour odor is one of the most reliable at-home clues. If you also see a brown, waxy discharge, yeast is a common culprit.
3. Feel
Gently massage the base of the ear. Heat, pain, or a wet "squelching" sound points toward infection. If your dog flinches sharply or yelps, stop and book a vet visit — a painful ear needs professional handling, not more prodding.
If the ear looks or smells off but your dog isn't in pain, a careful clean is a reasonable next step. Our walk-through shows how to clean your dog's ears at home safely — and, just as importantly, when cleaning is the wrong move.
What the discharge is telling you
The color and texture of ear discharge are clues, not diagnoses — and because overlapping infections are common, treat this as a starting hypothesis rather than a verdict.
| What you see | Common association |
|---|---|
| Brown, waxy, greasy | Yeast (Malassezia), usually with a musty odor |
| Yellow to green, pus-like | Bacterial infection |
| Dark, dry, coffee-ground-like | Ear mites (more typical in puppies) |
| Heavy black wax | Chronic yeast or a mixed infection |
Because yeast and bacteria frequently occur side by side, color alone can mislead you. Our comparison of how to tell yeast from bacterial infections explains why a laboratory look at the discharge — not the naked eye — settles the question.
Could it be something else?
Several conditions mimic an ear infection; this short list helps you decide how urgently to act.
| Possibility | Tell-tale clue | Itch level |
|---|---|---|
| Yeast or bacterial infection | Odor, redness, brown or yellow discharge | Moderate to high |
| Ear mites | Dry, dark, coffee-ground debris; often both ears; contagious | Very high |
| Underlying allergies | Recurring infections plus itchy paws, belly, or face | High |
| Excess wax only | Waxy but no odor, redness, or pain | Low |
| Foreign body (e.g. a grass seed) | Sudden, one-sided head-shaking after time outdoors | Variable |
Allergies deserve special mention: underlying allergic skin disease is one of the most common reasons ears keep flaring up, so a dog with "three ear infections this year" often has a skin problem, not an ear one.
How your veterinarian confirms an ear infection
A vet reaches a diagnosis with two quick tools. An otoscope shows whether the eardrum is intact — a detail that changes which medications are safe to use. Cytology, a swab examined under a microscope, then identifies whether yeast, bacteria, or mites are involved. That step is why home guessing falls short: yeast and bacteria need different treatments, and the wrong product drags things out. Once the cause is known, your vet maps out a plan — our overview of dog ear infection treatment covers what to expect, and if drops are prescribed you can read up on the prescription and over-the-counter antifungal options commonly used.
When to see your veterinarian
Use the home check to gather information, not to replace a professional. Book a visit promptly — or seek same-day care — if you notice:
- Obvious pain, crying out, or a swollen ear flap (a possible aural hematoma).
- Head tilt, stumbling, circling, or flickering eyes — signs the deeper ear may be involved.
- Sudden loss of hearing, bleeding, or thick pus.
- Symptoms that don't improve within a day or two, or that keep coming back.
One safety rule matters above all: if there's any chance the eardrum is damaged, never pour cleaners, home remedies, or oils into the ear. That call belongs with your vet.
Supporting ear health from the inside out
Because most ear infections are secondary to allergies and yeast overgrowth rather than starting in the ear itself, daily habits matter: dry the ears thoroughly after swimming or baths, manage any allergies with your vet, and run the three-step check weekly on floppy-eared breeds. Alongside veterinary care, some owners add daily inside-out support. Pure Majesty Pets Yeast Infection Drops combine caprylic acid — a medium-chain fatty acid studied in the laboratory for activity against Candida-type yeast — with supporting botanicals to help maintain a balanced skin and ear environment in dogs prone to recurrent yeast issues. They are supportive care, not a treatment for an active infection, and work best as a complement to a vet's plan. Browse the wider yeast-relief collection or learn more at Pure Majesty Pets.
Frequently asked questions
Can I check my dog's ears at home?
Yes. Looking, sniffing, and gently feeling the outer ear is safe and genuinely informative. What you should not do is insert cotton swabs or push cleaner deep into a painful ear — that risks injury and can drive debris further in.
How do I know if my dog has an ear infection or just dirty ears?
Dirty ears have wax but little odor, redness, or discomfort. An infection adds a distinct yeasty or sour smell, visible redness, and itch or pain. When odor and redness appear together, lean toward infection and call your vet.
What does a dog ear infection smell like?
Yeast infections smell musty or "cheesy," often compared to corn chips; bacterial infections lean sharply sour. A smell noticeable from a few inches away is a strong signal.
Will a dog ear infection go away on its own?
It's unlikely. Most ear infections stem from an underlying trigger — allergies, moisture, or yeast — that persists until treated, so waiting usually means more pain and a harder-to-clear infection.
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.
This article is for general educational purposes and is not a substitute for professional veterinary advice. If you suspect your dog has an ear infection, please consult your veterinarian for diagnosis and treatment.