How to tell if your dog has an ear infection comes down to three senses and about a minute of your time: lift the ear flap and look for redness or a waxy build-up, breathe in close for a yeasty or sour odour, and press gently at the base of the ear to see whether your dog leans away in discomfort. When two or more of those signals turn up together, otitis externa — an outer-ear infection — is the likeliest culprit, though only your veterinarian can confirm the cause with a quick swab. This guide gives Canadian dog owners the seven signs that matter most, a 60-second home check, and the red flags that mean a clinic visit shouldn't wait.
The seven signs that point to an ear infection
Ear infections rarely reveal themselves through a single symptom. Treat the signs below as a tally: the more you can tick off in one sitting, the more likely this is an infection rather than ordinary wax. For the full early-warning picture, our Canadian guide to dog ear infection symptoms unpacks each one in detail.
| Sign | What it looks like at home | Why it happens |
|---|---|---|
| Shaking or tilting the head | Repeated flapping; carrying the head at an angle | Irritation or fluid deep in the canal |
| Scratching and rubbing | Digging at the ear; dragging it along the couch or carpet | Itch from yeast or bacterial overgrowth |
| Odour | A musty, yeasty, or sour smell you notice from a few inches away | Microbial overgrowth, often Malassezia yeast |
| Discharge | Brown, waxy gunk or yellow-green material at the opening | Active infection; the colour hints at the cause |
| Redness and swelling | An angry-looking canal or a puffy, warm ear flap | Inflammation of the ear lining |
| Pain and heat | Flinching, whimpering, or an ear that feels hot to the touch | A deeper or more advanced infection |
| Change in behaviour | Grumpiness, less interest in play, a quieter appetite | Ongoing, low-grade discomfort |
A 60-second look, sniff, and touch check
You don't need an otoscope for a useful first pass. Pick a calm moment — after a walk in Toronto or an evening on the couch in Vancouver works well — find good light, and stay gentle. Never push anything into the ear canal.
1. Look
Fold back the ear flap and study the part of the canal you can see. A healthy ear is pale pink with a trace of wax and no crusting. Warning signs include redness, a brown or yellowish build-up, scabs, or thinning hair around the opening.
2. Sniff
Bring your nose close to the ear. A healthy ear is almost odourless, so a strong yeasty smell — owners often compare it to corn chips — or a sharp, sour note is one of the most dependable clues you can gather at home. Pair that odour with a brown, waxy discharge and yeast becomes a leading suspect.
3. Touch
Massage the base of the ear with light pressure. Heat, obvious pain, or a wet squelching sound points toward infection. If your dog jerks away or yelps, stop — a painful ear needs a veterinarian's hands, not more prodding at home.
Reading the discharge: colour and texture
The colour and consistency of ear discharge are clues, not verdicts. Because overlapping infections are common, treat what you see as a working hypothesis, not a diagnosis.
| What you see | Common association |
|---|---|
| Greasy, wax-like brown | Yeast overgrowth (Malassezia), typically with that musty note |
| Creamy yellow or green | Bacterial infection |
| Crumbly dark specks, like coffee grounds | Ear mites, most often in puppies and newly adopted rescues |
| Thick, near-black wax | Long-standing yeast or a combined infection |
Because yeast and bacteria so often appear together, colour alone can mislead. Our comparison of how to tell yeast from bacterial infections explains why a lab look at the discharge — not the naked eye — settles the question.
Could it be something other than an infection?
Several conditions imitate an ear infection; this list helps you gauge how quickly to act.
| Possibility | Tell-tale clue | Itch level |
|---|---|---|
| Yeast or bacterial infection | Odour, redness, brown or yellow discharge | Moderate to high |
| Ear mites | Dry, dark, coffee-ground debris; often in both ears; contagious | Very high |
| Underlying allergies | Repeat infections plus itchy paws, belly, or muzzle | High |
| Excess wax only | Waxy but no odour, redness, or pain | Low |
| Foreign material (grass or plant debris) | Sudden, one-sided head-shaking after a hike or romp in tall grass | Variable |
Allergies deserve a mention: allergic skin disease is one of the most common reasons Canadian dogs' ears keep flaring up, so a dog with "three ear infections this year" usually has a skin problem driving the ears, not an ear problem itself.
How a Canadian vet confirms an ear infection
Your veterinarian reaches a diagnosis with two quick tools. An otoscope reveals whether the eardrum is intact — a detail that decides which medications are safe to use. Cytology, a swab examined under the microscope, then shows whether yeast, bacteria, or mites are behind the trouble. That's why guessing at home falls short: yeast and bacteria need different treatments, and the wrong product only drags things out. Once the cause is clear, your vet builds 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.
When to see your veterinarian
Use the home check to gather information, not to replace professional care. Book a visit promptly — or seek same-day attention — if you notice:
- Clear pain, crying out, or a swollen ear flap (a possible aural haematoma).
- Head tilt, stumbling, circling, or flickering eyes — signs the deeper ear may be involved.
- Sudden loss of hearing, bleeding, or thick pus.
- Signs that don't ease within a day or two, or that keep returning.
One safety rule outranks the rest: if there's any chance the eardrum is damaged, never pour cleaners, home remedies, or oils into the ear. That decision belongs with your veterinarian.
Heading off repeat infections from the inside out
Because most ear infections in Canada are secondary to allergies and yeast overgrowth rather than starting in the ear itself, everyday habits carry real weight. Dry the ears thoroughly after a swim at the cottage or a bath, manage any allergies with your vet, and run the three-step check weekly on floppy-eared breeds — humid Ontario summers and damp West Coast winters both make moisture-loving yeast feel at home. Alongside veterinary care, some owners add daily inside-out support. Pure Majesty Pets Yeast Infection Drops pair caprylic acid — a medium-chain fatty acid studied in the lab for activity against Candida-type yeast — with supporting botanicals to help maintain a balanced skin and ear environment in dogs prone to recurrent yeast. They are supportive care, not a treatment for an active infection, and work best alongside your vet's plan. Browse the wider yeast-relief collection or learn more about our approach at Pure Majesty Pets.
Frequently asked questions
Can I check my dog's ears at home?
Absolutely. A visual once-over, a careful sniff, and a light touch along the outer ear give you real information at no risk. The line not to cross is the canal itself: don't jam cotton swabs into it or flush cleaner down a tender ear, which can injure the lining and pack debris deeper.
How do I know if my dog has an ear infection or just dirty ears?
It comes down to smell and comfort. A grubby but healthy ear carries wax without much odour and doesn't trouble your dog; an infected one layers on that tell-tale yeasty or sour smell, a reddened canal, and real itch or pain. Odour and redness together tip the odds toward infection — phone your vet.
What does a dog ear infection smell like?
Yeast gives off a musty, cheesy note that many owners compare to corn chips, while a bacterial infection reads as sharply sour. If you can pick up the odour without pressing your nose against the ear, treat it as a meaningful sign.
Will a dog ear infection clear up on its own?
Rarely. The trigger underneath — an allergy, trapped moisture, or a yeast overgrowth — keeps working even once the ear looks a little calmer, so waiting it out usually buys your dog more discomfort and a tougher infection to clear later.
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.