"My Cocker Spaniel's ears smell really bad, even though he was groomed just last week — is that normal?" It is not normal. And our guess: there is most likely already an otitis externa that has been going on for several weeks, more than just being "dirty."
Dogs face a unique challenge compared to cats when it comes to ear health — especially floppy-eared breeds. Cocker Spaniel, Basset Hound, Beagle, Golden Retriever, Labrador Retriever — all have a far higher predisposition to otitis externa than upright-eared breeds. Not because the breed is "weak," but because the floppy-ear anatomy makes the canal a warm, dark, moist environment that is perfect for yeast and bacteria to grow.
This article covers why floppy-eared breeds are more prone, the right cleaning frequency per ear type, the causes of otitis externa (primary vs secondary), products that are safe vs DANGEROUS, the correct step-by-step technique, and when the condition needs to see a vet — including post-swim control for dogs that swim often.
Why floppy-eared dogs are more prone to otitis
Several dog breeds have a very high prevalence of recurrent otitis externa throughout their lives. This is no coincidence — a combination of anatomy + allergy genetics contributes:
- Cocker Spaniel — candidate #1, a combination of floppy ears + an ear canal with many cerumen glands + a genetic allergy predisposition. Many Cockers have chronic otitis that is difficult to control for life.
- Basset Hound — very long, heavy ears, a permanently moist + dark canal.
- Beagle — moderately floppy ears, moderate-to-high otitis prevalence.
- Golden Retriever, Labrador Retriever — floppy ears + love of swimming + atopic dermatitis predisposition = a triple-risk combination.
- Poodle, Bichon Frise, Schnauzer — hair growing inside the ear canal (hair-in-canal) plus a genetic allergy predisposition.
- Bulldog, Pug, French Bulldog — brachycephalic, a stenotic (narrow) ear canal by anatomy = poor drainage.
- Shar-Pei — a very narrow ear canal + heavy skin folds = very difficult to clean.
The mechanisms behind the predisposition:
- Moisture trap — the pinna covering the ear canal stops air from circulating, trapping moisture. Yeast (Malassezia pachydermatis) thrives in warm + moist conditions (37°C body temp, moisture from cerumen + secretions). Bacteria such as Staphylococcus pseudintermedius and, in chronic cases, Pseudomonas aeruginosa also like it.
- L-shaped canal anatomy — like cats and all carnivores, the dog's ear canal is L-shaped (vertical descent, then a 90-degree turn to horizontal toward the eardrum). Self-drainage is suboptimal if the pinna keeps it covered.
- Genetic allergy predisposition — many breeds predisposed to chronic otitis are also predisposed to atopic dermatitis (environmental allergy). The ear is one of the most common manifestations of atopy — sometimes even the only visible symptom.
- Ear canal anatomy — some breeds have a very narrow canal (Shar-Pei) or many cerumen glands (Cocker), causing excess cerumen production.
Bottom line: if you have a predisposed breed, ear care is not optional prevention — it's mandatory lifelong maintenance, just like you have to brush teeth regularly.
Anatomy of the dog's external ear canal — a mirror of the cat's, but with nuances
The dog's ear canal is L-shaped (or J-shaped), the vertical part descending from the pinna then turning 90 degrees to horizontal toward the eardrum. A few characteristic nuances in dogs:
- The canal is longer than a cat's — especially in large breeds (Great Dane, Mastiff). The implication: the cleaner has to flood in plenty so it reaches the bend; a push-with-a-cotton-bud technique (absolutely forbidden, see below) is even more damaging.
- Hair in the canal in some breeds (Poodle, Schnauzer) — hair grows inside the canal, sometimes requiring gentle plucking with the fingers + special powder during grooming. But it's controversial — aggressive plucking actually causes trauma + micro-wounds, which become entry points for infection. Consult an experienced vet/groomer.
- The eardrum (tympanic membrane) — just as thin as a cat's. A perforated eardrum = ototoxic medication can damage the middle/inner ear = vestibular signs (head tilt, ataxia, nystagmus) until it heals, sometimes permanently if the wrong drug is chosen.
- Cerumen + sebaceous glands — the dog's ear canal naturally produces more cerumen than a cat's, especially in predisposed breeds. The cerumen layer has a protective function (a natural antibacterial), so over-cleaning that completely removes this layer actually predisposes to infection.
Ear cleaning frequency per dog ear type
There is no one universal answer — it depends on your dog's ear anatomy and history:
Upright ears (German Shepherd, Husky, Doberman, Akita)
1-2x per month as light maintenance, or only if there is visible debris / dirt after playing outside. Upright ears have excellent natural ventilation — air flows freely, the canal stays dry. Over-cleaning actually causes problems.
Semi-erect / drop ears (Beagle, Whippet, Border Collie)
2x per month as a routine, increasing if there is a history of otitis or after playing in water / getting dirty.
Floppy ears / predisposed breeds (Cocker Spaniel, Basset, Golden, Labrador, Bulldog, Shar-Pei)
1x per week as routine maintenance, more often if there is a history of recurrent otitis or after swimming. For dogs with chronic otitis, a vet sometimes recommends 2-3x per week plus a medicated cleaner (Tris-EDTA or a specific formula).
Dogs that swim / bathe often
Swimming = water enters the canal = trapped moisture = happy yeast. A drying ear cleaner is mandatory after swimming (Tris-EDTA or a cleaner with a mild astringent), even for upright-eared dogs. Besides drying, Tris-EDTA also has an antibiotic-potentiating effect (if treating Pseudomonas).
What NOT to do
- Routine cleaning of a healthy upright-eared dog with clean ears — not necessary, it actually disturbs the protective cerumen
- Skipping cleaning in a floppy-eared dog that already has a history of otitis — recurrence is very common if maintenance is stopped
- Aggressive daily cleaning of a dog with no indication — irritates the epithelium, predisposes to otitis
Signs of otitis externa in dogs
Check your dog's ears — lift the pinna gently, look inside (only as far as visible, don't poke a finger in):
- Repeated head shaking — several times a day, sometimes with a whimper
- Scratching the ears — especially with the hind legs, to the point of causing a wound on the pinna or in front of the ear
- Rubbing the head on the carpet / sofa / your legs — the dog seeking itch relief
- Dark discharge (dark brown / black) — characteristic of Malassezia yeast, sticky and moist
- Purulent yellow-green discharge — characteristic of bacterial infection (Staph or Pseudomonas)
- Foul smell — a characteristic sour / yeasty smell (Malassezia) or a severely rotten smell (Pseudomonas bacteria)
- Pinna swelling / redness
- Painful on palpation — the dog suddenly pulls its head away or growls when the ear or base of the ear is touched lightly
- Head tilt — the head permanently tilted to one side → an indication of otitis media (middle ear) or interna, a vestibular emergency
- Ataxia / nystagmus / circling — vestibular involvement, see a vet now
- Aural hematoma — the pinna swollen like a balloon because excessive head shaking ruptured blood vessels in the pinna, requires drainage
Primary cause vs secondary infection — why otitis keeps coming back
This is the part owners most often miss. Treating otitis without addressing the primary cause = recurrence every time. Modern veterinary dermatology uses the PSPP framework (Primary, Secondary, Predisposing, Perpetuating).
Primary cause — why otitis appears in the first place
- Atopic dermatitis (environmental allergy) — the #1 cause of chronic recurrent otitis in dogs. Allergens like house dust mites, pollen, and environmental molds trigger an allergic reaction that manifests in the skin + ears. Many atopic dogs have otitis as the only visible symptom.
- Food allergy / food intolerance — proteins from food trigger a skin + ear reaction. Rarer than atopy but possible, especially in dogs with recurrent otitis + mild GI problems.
- Ear mites (Otodectes cynotis) — rarer in adult dogs than in cats, but very possible in puppies and rescue dogs. Characteristic: black coffee-grounds debris.
- Foreign body — grass awn (small barbed grass), sand, dust — often in outdoor / hunting breeds. Can lodge at the bend of the canal, triggering acute unilateral otitis (one side only).
- Endocrine disorders — hypothyroidism, Cushing's syndrome — predispose to chronic otitis via systemic effects on the skin.
- Trauma — injury from rough grooming, cotton buds (don't!), or rough play.
- Tumor / polyp in the ear canal — rare but possible, especially in senior dogs, triggering persistent unilateral otitis.
Secondary infection — opportunistic bacteria / yeast that move in
Once the primary cause makes the canal inflamed + moist + the barrier damaged, the surrounding microbes move in. Without a primary cause, secondary infection won't grow — but once it has grown, it needs targeted treatment.
- Malassezia pachydermatis (yeast) — the most common, a characteristic sour-yeasty smell, sticky dark brown discharge. Treatment: an antifungal-category ear cleaner (chlorhexidine, climbazole, miconazole) per the vet's prescription.
- Staphylococcus pseudintermedius (gram-positive bacteria) — often coexists with Malassezia in simple acute otitis.
- Pseudomonas aeruginosa (gram-negative bacteria) — notoriously difficult to treat, often with a multi-drug-resistant pattern, purulent yellow-green discharge, a very foul smell. Requires a swab culture + sensitivity test for antibiotic selection. Tris-EDTA as an adjuvant often helps (potentiates antibiotics + changes ear pH).
Predisposing factors — conditions that make the ear more prone
- Floppy-ear anatomy / predisposed breeds
- Frequent swimming / bathing
- A humid tropical climate (Indonesia falls into this category)
- Hair in the ear canal in certain breeds
Perpetuating factors — what makes it hard to heal / recur often
- Chronic inflammation makes the canal stenotic (narrowed), drainage gets worse
- An eardrum that is already chronically perforated
- Otitis media (middle ear) that coexists but has not been treated
Practical implication: if your dog has had otitis more than 2-3 times in a year, don't just ask the vet for antibiotics — ask for a PSPP framework evaluation. Address atopic dermatitis if needed, evaluate an elimination food trial if food allergy is suspected. Treating the ear repeatedly without a primary cause = a tiring treadmill + costs that keep rising.
Ear cleaner products that are safe vs DANGEROUS
The safe ones — vet-formulated, pH-balanced, per indication
- Virbac Epi-Otic Advanced — the gold standard for maintenance + light cleaning. pH-balanced, salicylic acid + mild chlorhexidine, safe for routine use.
- Virbac CleanAural — a maintenance alternative.
- Dechra TrizUltra + Keto — Tris-EDTA + ketoconazole, for dogs with recurrent Malassezia yeast.
- Tris-EDTA solution (TrizChlor, Mal-Acetic, etc.) — a drying agent + antibiotic potentiator, for dogs post-swim or being treated for Pseudomonas. Tris-EDTA changes the ear canal pH and disrupts bacterial biofilm, so topical antibiotics can work more effectively.
- Vetericyn Plus Ear Rinse — basic saline-based for sensitive dogs.
- Otoclean (a local Indonesian formula) — depends on the manufacturer, check for pH-balanced + non-ototoxic claims, confirm with a vet before use.
For cases with a confirmed secondary infection (yeast / bacteria), a vet usually prescribes a combination of an ear cleaner + a medicated topical (an antibiotic + antifungal + steroid ear drop). DO NOT use a medicated topical without a vet's prescription — many are ototoxic if the eardrum is perforated.
The DANGEROUS ones — DO NOT use
- Hydrogen peroxide (H2O2) — ototoxic if the eardrum is perforated, creates foam that irritates the sensitive canal, and the "wound disinfectant" myth does not apply to ears. Stop using it on dogs.
- Alcohol (rubbing alcohol, isopropyl) — severe stinging in an inflamed canal, drying that is too aggressive, psychological trauma making the dog harder to handle around the ears going forward.
- Human ear cleaner — pH mismatch, a formula not tested for dogs.
- White vinegar — once went viral on DIY forums. Some recommendations call for diluted vinegar for yeast — theoretically correct (an acidic environment inhibits Malassezia), but the wrong concentration = severe irritation, and vinegar is not adequate for moderate-to-severe infection. Use a proper vet-formulated product.
- Plain water or excessive saline — no antimicrobial effect, traps moisture (which is actually the main problem).
- Mineral oil / baby oil without a vet's direction — trapped in the canal, a growth medium for microbes.
- Soap / shampoo — wrong pH, irritant, not designed for inside the canal.
DO NOT use cotton buds inside the canal
Same as with cats. Cotton buds to wipe the outer pinna are fine (the VISIBLE part), but entering the dog's vertical ear canal — never. The risks:
- Pushing debris into the L-bend (deeper, harder to remove)
- Perforating the eardrum if the dog suddenly moves / head shakes
- Cotton fibers left behind as a foreign body
- Micro-trauma to the mucosa = an entry point for infection
Dogs are strong and sometimes cooperative, so owners get bolder than with cats — which is actually more dangerous. Stick to flooding + massage + letting the dog head shake + wiping the outer ear.
The correct step-by-step ear cleaning technique
Preparation
- Warm the ear cleaner bottle in your hands for a few minutes (a cold cleaner = the dog is startled, an aggressive head shake reflex)
- Choose an easy-to-clean location (bathroom or outdoors) — debris + cleaner will fly when the dog head shakes
- Prepare cotton pads / cotton wool to wipe the outer ear (NOT cotton buds)
- A tasty treat reward on the side (regular kibble is not motivating enough for this procedure)
- For small-to-medium dogs: on your lap or while sitting on the floor. For large dogs: leashed while sitting, or standing but with an assistant holding the head steady
Step 1: Flooding the canal
Lift the pinna upward (for floppy ears, this step is important because it opens the vertical canal that is usually covered). Hold the tip of the ear cleaner bottle at the mouth of the canal (not inside the canal — just at the outer opening), and squeeze the bottle until the liquid floods in until the canal is filled. Amount: 2-5 mL for small dogs, 5-10 mL for large dogs (or per the product label instructions).
Step 2: Massage the base of the ear for 30 seconds
Close the pinna gently, then massage the base of the ear (the area below the pinna, between the pinna and the lower jaw) with gentle circular motions for a full 30 seconds. You'll hear a "squelching" sound from inside — that's the cleaner working to loosen debris from the canal wall + the L-bend.
Some dogs enjoy this massage step (it feels relieving), some are uncomfortable — adjust the pressure, don't press too hard.
Step 3: Let the dog head shake
Release the pinna, give a command / encouragement so the dog head shakes. This shake reflex expels debris + cleaner from the canal onto the pinna. DO NOT replace this with a cotton bud push. Head shaking can take 10-30 seconds, let it go until the dog is satisfied.
Tip: stand back a little — debris + cleaner will fly within a 1-2 meter radius.
Step 4: Wipe the outer ear with a cotton pad / cotton wool
After the head shaking is done, wipe the pinna and the outer area with a cotton pad or cotton wool. DO NOT enter the canal. Just collect the debris that has already come out.
Step 5: Reward + repeat on the other ear
Give a treat + praise. Pause for 1-2 minutes, then repeat for the other ear.
If the vet prescribes a topical medication (medicated ear drops)
Applying medicated ear drops is done after cleaning + drying, so the medication makes direct contact with the canal wall. The order: cleaning (flooding + massage + head shake + wipe) → wait 5-10 minutes for the canal to dry → apply the drops at the prescribed dose → briefly massage the base of the ear again so the medication distributes.
Post-swim ear care
Dogs that swim often (Labrador, Golden, Spaniel water breeds) must have post-swim ear cleaning for drying — especially in Indonesia's humid tropical climate.
- Wipe the pinna and outer ear with a towel to dry the visible moisture
- Flood a drying ear cleaner (Tris-EDTA or an alternative) into the canal — a few mL per ear
- Massage the base of the ear for 20-30 seconds
- Let the dog head shake — expelling water + residual cleaner
- Wipe the outer ear again with a clean cotton pad
The whole procedure takes < 5 minutes per dog. Do it after every swim — even one skipped session can trigger otitis in a predisposed dog.
When to see a vet
- Severe pain — the dog yelps / bites when the ear is touched lightly
- Blood in the discharge or on the pinna (a wound from excessive scratching, or something more serious)
- Head tilt / ataxia / nystagmus / circling — a vestibular emergency, see a vet right now (otitis media/interna)
- Aural hematoma — the pinna swollen like a balloon, requires drainage (if left, it becomes a permanent cauliflower ear)
- No improvement after 5-7 days of cleaning + an OTC ear cleaner — needs a swab cytology evaluation to identify the secondary infection
- Recurrence within 2-3 months after treatment — evaluate the primary cause (atopy, food allergy, endocrine)
- A senior dog with new unilateral otitis — check for a tumor / polyp, don't assume a routine infection
- Purulent yellow-green discharge + a very foul smell — suspect Pseudomonas, needs a swab culture + sensitivity, targeted antibiotics
- A dog with otitis for the first time — it's best to get a vet evaluation first for a baseline + to check the eardrum status before the owner cleans at home
Dog ear cleaning FAQ
My Cocker Spaniel has otitis constantly, 4 times in a year — why?
This pattern is very characteristic of atopic dermatitis. We strongly recommend consulting a vet (ideally a dermatology vet) for an atopy evaluation. Treatment options: lifestyle (controlling environmental allergens), Apoquel/Cytopoint/cyclosporine (systemic atopy therapy), an elimination food trial, immunotherapy (allergen-specific). Treating the ear repeatedly without addressing the primary cause = recurrence every time. Ear maintenance cleaning is still needed, but as an adjuvant — not the only thing.
My dog is a Golden Retriever and loves swimming in the pool — does he need ear cleaning every day?
Not every day. But after every swim. Use Tris-EDTA or a drying ear cleaner, the whole process < 5 minutes. Skipping post-swim cleaning in Indonesia's climate = setting up otitis within a few weeks. Plus 1x per week general maintenance cleaning for consistency.
My dog's ears smell but there's no visible discharge — why?
The smell usually comes earlier than visible discharge. Malassezia yeast grows inside the canal before discharge emerges in a noticeable amount. Wipe the pinna with cotton wool + check the color — if there is a brown / yellow stain, there is likely an early infection. Get a vet evaluation for a swab cytology + targeted treatment.
Can I pluck the hair growing inside my Poodle's ear?
It's controversial. Some groomers + vets routinely do gentle plucking with the fingers + ear powder; some modern researchers actually do not recommend it because plucking causes micro-trauma + an entry point for infection. The safer default: leave it unless there is hair that clearly obstructs drainage, or recurrent otitis for which the vet recommends plucking as part of treatment. DO NOT take it upon yourself to do aggressive plucking.
Can I use one ear cleaner product for both dog + cat?
Most products formulated for dogs are also safe for cats if they are pH-balanced + non-ototoxic — but confirm the label. DO NOT do the reverse: some dog products with high concentrations or certain ingredients (essential-oil-based, some antifungals) can be dangerous for cats, which have species-specific metabolism. For those with a multi-species household, buy per species if there is a label conflict.
My dog really refuses to have his ears handled — what do I do?
A gradual desensitization approach: touch the face → touch the pinna → lift the pinna briefly → touch the base of the ear → an empty cleaner bottle at the canal (without flooding, just a simulation) → the real cleaner. Reward each step with a tasty treat (one the dog really likes, not regular kibble). A few days to 2 weeks before real cleaning. If he really can't be handled, consult a vet for training + possibly light sedation for an initial clinic diagnostic.
Summary
Dog ear care depends heavily on anatomy and history — a healthy upright-eared dog doesn't need routine cleaning (1-2x/month max), a floppy-eared / predisposed breed needs weekly maintenance, a dog that swims often needs post-swim cleaning. Signs of otitis (head shaking, scratching, dark/purulent discharge, foul smell, pain) need a vet evaluation first — don't just clean without a diagnosis.
The most critical things to remember:
- A floppy-eared dog + tropics = mandatory weekly maintenance + post-swim cleaning
- Chronic recurrent otitis = address the primary cause (atopy #1, food allergy, endocrine) — not just treat the ear repeatedly
- A cotton bud NEVER enters the canal — same as cats, more dangerous because dogs are strong
- Hydrogen peroxide + alcohol = ototoxic + irritant, don't use them at all
- Use vet-formulated pH-balanced products (Epi-Otic, CleanAural, Tris-EDTA per indication)
- Pseudomonas (yellow-green discharge, very foul smell) = swab culture + sensitivity mandatory, don't assume a routine antibiotic is enough
- Head tilt / ataxia / nystagmus = vestibular emergency, see a vet now
Would you like a consultation about your dog's ear condition or need an in-home evaluation (swab cytology, choosing the right product, identifying the primary cause)? Contact us on WhatsApp — send photos of the ear (lift the pinna, photograph the visible canal), the signs you see (head shaking, scratching, discharge, smell), the dog's breed + age, and any history of previous otitis. The Prabasavet team will help with an initial evaluation and recommend next steps.
Read also: Dental brushing for cats and dogs: the safe way, frequency, and which paste to use, Claw trimming for cats and dogs: the safe way, tools, and avoiding injury, Osteoarthritis in senior dogs: signs and multimodal management, Complete pet care guide.
Medical references used in this article
This article was prepared with reference to the following sources, verified per clinical statement:
- ACVD (American College of Veterinary Dermatology) Atopic Dermatitis Consensus Guidelines — atopic dermatitis as the #1 primary cause of chronic otitis in dogs, the diagnostic framework, systemic therapy options
- Harvey RG, Paterson S. Otitis Externa: An Essential Guide to Diagnosis and Treatment — the PSPP framework (Primary, Secondary, Predisposing, Perpetuating), dog ear canal anatomy, cleaning techniques, referral indications
- BSAVA Manual of Canine and Feline Dermatology 4e — the dog otitis externa chapter, predisposed breeds, Malassezia + Pseudomonas treatment, Tris-EDTA adjuvant
- AAHA Canine and Feline Behavior Management Guidelines — handling fearful dogs for clinical + at-home procedures, desensitization protocols
- Plumb's Veterinary Drug Handbook 7e — monographs on ear cleaning solutions, topical antifungals (clotrimazole, miconazole, ketoconazole), topical antibiotics (gentamicin, enrofloxacin, polymyxin B), dosing and contraindications with a perforated eardrum
- Greene CE. Infectious Diseases of the Dog and Cat — the Malassezia + Pseudomonas ear infections chapter, the multi-drug resistance pattern of Pseudomonas, swab culture indications
This article is a general guide based on the international guidelines of ACVD, BSAVA, AAHA, and standard veterinary textbooks. For an evaluation specific to your dog's ear condition + choosing the right product + identifying the primary cause, consulting a veterinarian is the right step.
