Signs of Ear Infection in Dogs: Early Symptoms & Vet Guide for Australia

Quick answer: The most common signs of ear infection in dogs are repeated scratching or pawing at one ear, head shaking or tilting, a musty or yeasty odour, redness or swelling inside the ear flap, and brown, black or yellow discharge. These signs point to otitis externa, inflammation of the ear canal, and warrant a vet exam if they last more than a day or two, or if your dog seems painful. For routine cleaning between vet visits, the Pure Majesty Pets Dog Ear Cleaner is A$43 with free shipping to Australia, duties and GST prepaid.

If your dog is pawing at one ear, shaking their head, or you've caught a whiff of something off when you lean in to pet them, you're likely looking at early otitis externa, veterinary shorthand for inflammation of the outer ear canal. It's the most frequently diagnosed ear condition in dogs, and catching it in the first day or two, before the canal narrows with swelling, makes treatment faster and considerably less expensive. This guide is written for Australian owners, where humid summers, beach and river swims and floppy-eared favourites such as Labradors and Cavoodles all raise the stakes for ear care.

What Are the Main Signs of Ear Infection in Dogs?

Clinical signs of otitis externa recognised by the Merck Veterinary Manual include head shaking, pruritus (itching), pain, malodour, erythema (redness), erosions or ulcerations of the canal skin, and oedema (swelling). In plain terms, that translates to the behaviours and physical changes most owners notice first:

1. Scratching or Pawing at One Ear

Occasional scratching is normal. A dog fixating on one specific ear, pawing at it repeatedly, especially after naps, meals or walks, is signalling localised irritation rather than general itchiness.

2. Head Shaking or Head Tilt

Vigorous shaking, "scrubbing" the ear against furniture or carpet, or holding the head tilted toward the affected side is the dog's attempt to relieve pressure or dislodge discomfort inside the canal. A tilt that doesn't resolve, or is paired with wobbliness, needs prompt veterinary attention since it can indicate the infection has progressed toward the middle ear.

3. A Musty, Yeasty or Foul Odour

A healthy canine ear has little to no smell. An odour, often described as musty, sweet or "old popcorn", signals microbial overgrowth. This is frequently the first thing owners notice, since it's detectable before visible discharge appears.

4. Redness, Swelling or Discharge

Lift the ear flap and check the inside surface. A healthy canal is pale pink with minimal wax. Redness, visible swelling at the canal opening, or discharge (brown-to-black, commonly seen with yeast or ear mites; yellow or green, more typical of bacterial infection) are hallmark signs of active otitis.

5. Pain or New Sensitivity Around the Head

A dog that flinches, pulls away or vocalises when you touch an ear that previously tolerated handling is telling you the canal is inflamed enough to hurt. Pain is one of the clinical signs the Merck manual lists explicitly, and it's a stronger "see a vet now" signal than odour or mild redness alone.

What Causes Ear Infections in Dogs?

Otitis externa is rarely caused by one thing alone. Veterinary dermatology literature separates causes into primary triggers, predisposing factors, and perpetuating factors that keep an infection cycling.

Allergies are the leading primary cause. Hypersensitivity (atopic dermatitis and food allergy) is responsible for a large share of chronic and recurrent otitis cases; in dermatology referral practice, allergic disease is associated with roughly 75% of chronic otitis externa cases. The same immune over-reaction that causes paw licking and skin itching also inflames the ear canal lining, creating conditions where yeast and bacteria multiply. In Australia, the AVA's Vet Voice lists contact allergens such as buffalo grass, kikuyu and Wandering Jew (Tradescantia), which cause a red, itchy rash on paws, belly and armpits, so it is worth noting whether your dog's ear flare-ups follow time on the lawn or garden. If your dog has both ear and skin symptoms, our guide to dog ear infection treatment covers how to tell allergy-driven irritation apart from infection.

Ear anatomy and moisture are major predisposing factors. A dog's ear canal is L-shaped (vertical then horizontal), which traps moisture, wax and debris far more effectively than the relatively straight, open canal in humans. Research shows dogs with pendulous (floppy) ears have a higher incidence of infection than dogs with erect ears, since the flap reduces airflow and keeps the canal warm and humid. Swimming, bathing without thorough drying, and humid regional climates compound the effect. The WAVD consensus on Malassezia dermatitis (Bond et al., 2020) notes that Malassezia dermatitis is more common in tropical climates and warm, humid months, which is worth knowing if you live in Queensland or coastal NSW and your dog swims often.

Microorganisms are the proximate cause of most active infections. Malassezia pachydermatis yeast lives on healthy canine skin in small numbers, but studies using ear cytology report yeast overgrowth in more than half of dogs presenting with otitis. One retrospective study found yeasts in roughly 60% of infected ears, with M. pachydermatis as the sole organism identified in about a third of cases. Bacterial otitis, most often involving Staphylococcus (cocci) or, in more severe and chronic cases, Pseudomonas aeruginosa (rods), frequently follows or accompanies yeast overgrowth rather than occurring in isolation.

Dog Ear Infection: Yeast vs. Bacterial. What's the Difference?

Owners often ask whether their dog's ear infection is "yeast" or "bacterial". The honest answer is that many active infections involve both, and the only reliable way to know is ear cytology: a vet or technician takes a swab, stains it and examines it under the microscope to identify yeast, cocci or rods. That said, some patterns are common enough to be useful for deciding how urgently to act.

Because visual inspection alone cannot reliably distinguish yeast from bacterial otitis, or rule out a mixed infection, cytology remains the diagnostic standard. If discharge is yellow-green, thick or foul beyond the typical yeasty smell, treat that as a signal to see a vet rather than guess.

When to See a Vet for a Dog's Ear

Mild, early-stage irritation (light odour, minor scratching, no pain on touch) can often be managed at home with a gentle, dog-specific ear cleaner while you monitor for 3 to 5 days. Book a vet exam without waiting if you see any of the following:

• Pain when the ear is touched, or your dog won't tolerate the ear being examined
• Yellow, green or bloody discharge
• Swelling, heat, or a visibly narrowed canal opening
• Head tilt that persists, or any loss of balance or coordination
• No improvement after about a week of consistent home cleaning
• Recurrent infections in the same ear, which often indicate an underlying allergy that needs to be identified and managed

This matters because untreated otitis externa doesn't stay contained to the outer ear. Left unaddressed, infection and chronic head shaking can progress to otitis media (middle ear infection) or lead to rupture of the eardrum, and the scratching and shaking itself can rupture blood vessels in the ear flap, causing a painful aural haematoma that typically requires surgical drainage. None of these are things a cleaning routine alone can fix once they've developed. They need veterinary diagnosis and, often, prescription treatment. For a full breakdown of vet-recommended treatment options once an infection is confirmed, see our guide to the best dog ear infection treatment.

How to Clean a Dog's Ears the Right Way

For prevention and mild cases, veterinary sources recommend routine ear cleaning as a core part of managing ear health. It removes the debris, wax and biofilm that create the environment yeast and bacteria need to establish an infection. Guidance from veterinary dermatology literature suggests cleaning every 7 to 14 days for prevention in normal dogs, done more frequently for dogs prone to recurrence.

1. Fill the ear canal generously with a dog-specific cleaner. You cannot use too much.
2. Gently massage the base of the ear for about 20 seconds; you'll hear the solution working through the wax.
3. Step back and let your dog shake the solution and loosened debris out.
4. Wipe the visible flap and canal opening with a soft cotton pad. Never insert a cotton swab into the canal itself.
5. Repeat on the other ear, even if only one side shows symptoms.

Never use hydrogen peroxide, rubbing alcohol or undiluted vinegar inside the canal. These can sting already-inflamed tissue and, in the case of peroxide, may actually damage healthy cells lining the canal. After a swim at the beach, river or dog park, dry the flaps and the canal opening well, because moisture is exactly what yeast wants.

How Pure Majesty Pets' Ear Cleaner Compares

Not every "ear cleaner" is built for the job. Many products on the market are simple saline solutions that flush debris without addressing the two things that actually drive recurrence: leftover wax that feeds yeast, and a canal environment left out of balance. The live product page for our Dog Ear Cleaner (120 mL) describes a dedicated otic solution rather than a basic rinse, with 0.2% salicylic acid to soften and break down wax and flaky buildup, 10% aloe ferox plus panthenol (pro-vitamin B5) to soothe irritated skin, allantoin and phytosphingosine to support the ear's skin barrier, and natural cyclodextrin to trap and neutralise odour at the source rather than masking it with fragrance. The formula is pH-balanced to 5.0 to 5.5, closely matching a healthy canine ear canal's natural pH, and is chlorhexidine-free, a meaningful distinction for owners whose dogs react to the sting of harsher antiseptic-based cleaners. The page notes it should not be used on a ruptured eardrum.

What Australian ear cleaners cost

For context, these are the ear cleaners we saw listed in Australia on 7 October 2026. Prices change often, and we have not compared formulas head to head, so read each label for wax-softening agents, odour control and whether it contains chlorhexidine.

Ours is the highest-priced of the group, and it is built as a dedicated otic formula (salicylic acid, aloe, cyclodextrin, chlorhexidine-free). Ordering direct means the price on the page is the price at your door, with no GST or duties to pay on delivery. If you would rather pick one up in person, Petbarn, Pet Circle and Petstock are the usual Australian retail routes.

Important distinction: this cleaner is a hygiene and prevention product, not a medication. It supports the routine cleaning that veterinary sources associate with reduced recurrence after an infection has been treated, and it can help manage mild, early yeast overgrowth. It is not a substitute for veterinary diagnosis or prescription antimicrobial or antifungal treatment once an active infection with pain, swelling or abnormal discharge is present. If you notice any of the vet-visit signs above, a cleaner is the wrong first move. A diagnosis is.

For dogs with recurring yeasty ears, some owners also add daily internal support. Our Yeast Drops (A$47) are an oral liquid given with food, not ear drops, and are designed to help balance yeast from within; they sit alongside, not in place of, your vet's plan. For dogs prone to allergy-driven ear flare-ups, pairing a cleaning routine with our dog ear and eye cleaner guide on preventing infections or browsing the full dog ear and eye care collection can help you build a complete routine rather than treating ears in isolation. For a deeper read, see the complete dog ear health guide.

Practical Timeline: What to Expect

Setting realistic expectations helps you know whether a routine is working or whether it's time to call the vet.

• Days 1 to 3: With consistent cleaning for mild, early irritation, odour should noticeably lessen and scratching frequency typically decreases.
• Week 1: Visible wax and debris buildup should be reduced with each cleaning session; skin inside the flap should look less red.
• Weeks 2 to 4: For dogs on a consistent 2 to 3 times weekly maintenance routine, ears should stay visibly cleaner between sessions with minimal odour return.
• No improvement by day 5 to 7: This is the threshold most veterinary sources point to for seeking an exam. Home cleaning is not resolving what's likely a bacterial or more advanced yeast infection needing prescription treatment.

Frequently Asked Questions

What are the first signs of an ear infection in dogs?

The earliest signs are usually scratching or pawing at one specific ear, head shaking and a musty or yeasty odour, often noticeable before any visible discharge appears. Redness and sensitivity to touch typically follow as inflammation progresses.

How can I tell if my dog has an ear infection versus just dirty ears?

Normal ear wax is light tan or brown with little to no odour and doesn't cause your dog discomfort when touched. An infection typically brings a noticeable smell, darker or discoloured discharge, redness or swelling inside the flap, and behavioural signs like scratching, shaking or pain on touch.

Is my dog's ear infection yeast or bacterial?

Visual signs offer clues (musty odour with brown-black discharge leans yeast, while yellow-green discharge and more pronounced swelling lean bacterial), but many infections involve both organisms together. Ear cytology performed by a vet is the only reliable way to confirm which organisms are present and choose the right treatment.

When should I see a vet for my dog's ear?

See a vet promptly if your dog shows pain on touch, yellow, green or bloody discharge, swelling, a persistent head tilt, loss of balance, or if a week of consistent home cleaning hasn't improved mild symptoms. Recurrent infections in the same ear also warrant a vet visit to identify an underlying allergy.

Can I just use an ear cleaner instead of going to the vet?

A dog-specific ear cleaner is appropriate for routine maintenance and very mild, early-stage irritation, but it is not a treatment for an active, confirmed infection. If your dog is painful, has abnormal discharge, or isn't improving within about a week, veterinary diagnosis and, likely, prescription treatment are needed.

How often should I clean my dog's ears to prevent infections?

For most dogs, cleaning every 7 to 14 days supports normal ear health. Dogs with floppy ears, allergies, or a history of swimming or recurrent infections often benefit from cleaning 2 to 3 times per week, tapering as the ears stay consistently clean and odour-free.

What does the Pure Majesty Dog Ear Cleaner cost in Australia?

The Dog Ear Cleaner (120 mL) is A$43. Shipping is free worldwide and orders to Australia go out with duties and GST prepaid (DDP), so there is nothing to pay on delivery.

This article is for informational purposes and does not replace professional veterinary advice. If your dog shows signs of pain, abnormal discharge or a persistent head tilt, contact your vet promptly for an accurate diagnosis and appropriate treatment.