Quick answer: Dog scratching ears is most often caused by allergies (environmental or food), a yeast (Malassezia) or bacterial ear infection, ear mites (Otodectes cynotis), or trapped moisture in the ear canal. A vet exam with ear cytology is the only reliable way to tell these apart. Routine, gentle cleaning helps maintain healthy ears between checkups, but vinegar or hydrogen peroxide rinses can worsen an already-inflamed ear canal and should be avoided.
If your dog is scratching their ears, shaking their head, or grinding one ear into the carpet, the itch is a symptom — not the diagnosis. Dog scratching ears is one of the most frequent reasons dogs are brought into veterinary clinics, and according to the Merck Veterinary Manual, otitis externa (inflammation of the ear canal) can be triggered by allergies, yeast or bacterial overgrowth, parasites, or trapped moisture, often in combination.1 Figuring out which one is behind your dog's dog head shaking ears behavior determines whether a gentle cleaning routine will help or whether it's time to call the vet.
This guide walks through why dogs scratch their ears, how to tell ear mites from an infection, a safe at-home routine, and where a natural approach reaches its limit.
Why does my dog keep scratching his ears?
Persistent ear scratching almost always points to inflammation somewhere in the ear canal, and there are five usual suspects.
Allergies are the most common underlying driver
Veterinary dermatology research consistently identifies allergic skin disease — both environmental (atopic dermatitis) and food-related — as the leading underlying cause of recurring ear inflammation in dogs. A widely cited retrospective study found that atopic dermatitis was the primary cause in roughly 75% of dogs presenting with chronic or recurring otitis at referral dermatology practices, and food hypersensitivity was the second most common trigger, implicated in just over half of food-allergic dogs studied.2 In many of these dogs, ear inflammation shows up before any other allergy symptom — so an itchy ear can be the first visible clue that a dog has an underlying allergy, not an isolated ear problem.
Yeast overgrowth (Malassezia pachydermatis)
Malassezia pachydermatis is a yeast organism that lives on healthy dog skin in small numbers but can overgrow when the ear canal's warm, moist environment shifts — often as a downstream effect of allergies. Merck's Veterinary Manual notes that a dark, waxy discharge with a musty or yeasty odour is a common sign, and clinical descriptions of Malassezia otitis typically include redness, waxy brown-to-yellow discharge, and a distinct odour that owners often notice before visible discharge appears.1,3 If yeast is confirmed as the driver, our in-depth guide to treating a dog yeast infection covers diagnosis and treatment in more detail.
Bacterial infection
Bacterial otitis frequently occurs alongside yeast overgrowth rather than in isolation. It tends to be more painful than yeast alone, and discharge is often described as yellow-green and more liquid, sometimes with a stronger, more unpleasant odour. Dogs with a bacterial component are more likely to yelp or pull away when the ear is touched.1,4
Ear mites (Otodectes cynotis)
Ear mites are more common in puppies and dogs with recent exposure to other animals (shelters, boarding, multi-pet households), but they can affect a dog at any age. The hallmark sign is a dry, dark, crumbly discharge that resembles coffee grounds, along with intense itching that can look disproportionate to how "dirty" the ear appears.5 Diagnosis requires a vet to examine a sample of the debris under a microscope, since mites, yeast, and bacteria can look similar to the naked eye.
Trapped moisture and ear conformation
Dogs with floppy or heavily furred ears — Cocker Spaniels, Basset Hounds, Golden Retrievers, Labrador Retrievers — have reduced airflow in the ear canal. Swimming, bathing, or humid weather can leave moisture trapped inside, creating conditions where yeast and bacteria multiply more easily. This is a contributing factor rather than a root cause on its own, which is why dogs who swim frequently can still develop recurring ear issues even with a good cleaning routine.
Is it ear mites or an infection?
Because the visible signs overlap, owners often can't tell mites, yeast, and bacterial infection apart just by looking. A veterinarian uses an otoscope exam plus a swab sample examined under a microscope (ear cytology) to confirm which is present — sometimes more than one at once.1 The table below summarizes the general patterns reported in veterinary sources, but it is not a substitute for diagnosis.
| Feature | Ear mites (Otodectes cynotis) | Yeast (Malassezia) | Bacterial infection |
|---|---|---|---|
| Typical discharge | Dry, dark, crumbly — "coffee ground" texture | Waxy, brown to yellow, often abundant | Yellow-green, more liquid, occasionally blood-tinged |
| Odour | Usually mild or absent | Musty or yeasty smell | Stronger, more unpleasant odour |
| Pain level | Intense itching, less pain on touch | Itching with mild-to-moderate discomfort | Often notably painful when touched |
| Who's typically affected | Puppies, dogs with recent animal contact | Any age; often allergy-prone dogs | Any age; frequently alongside yeast |
| What to do | Vet exam + microscope confirmation; prescribed miticide | Vet exam + cytology; prescribed antifungal | Vet exam + cytology; prescribed antibiotic |
Because these causes require different treatments — and because over-treating the wrong cause wastes time while the real problem progresses — a same-week vet visit is the most reliable "home test" when ear scratching is new, worsening, or accompanied by odour or discharge.
How do I stop my dog scratching his ears?
Once a vet has ruled out or treated an active infection, a consistent, gentle maintenance routine is what keeps ears comfortable long-term. This is where a purpose-built cleaner matters: not every "ear cleaner" on the market is formulated the same way, and concentration, pH, and preservative quality all affect whether a solution helps or irritates.
A safe cleaning routine
- Use a vet-approved, pH-balanced ear cleaning solution — never a cotton swab, which can pack debris deeper into the canal.
- Fill the ear canal generously with solution and gently massage the base of the ear for 20–30 seconds until you hear a soft squelching sound.
- Let your dog shake their head to bring debris to the surface.
- Wipe the visible canal and ear flap with a cotton ball, going no deeper than the first knuckle of your finger.
- Dry ears thoroughly after swimming or bathing, and increase cleaning frequency temporarily during humid weather or allergy season.
Our dog ear cleaner is a vet-strength otic solution formulated specifically for routine wax, odour, and itch maintenance in a 120 mL bottle — sized for a full cleaning routine rather than a token trial size. It is designed to be part of an ongoing maintenance routine for healthy or recovering ears, not a treatment for an active, diagnosed infection; those require prescription antifungal, antibacterial, or antiparasitic medication from your veterinarian. You'll find it alongside our full range of dog ear care products. For a full walkthrough of building a routine around it, see our dog ear and eye cleaner guide, and our dog ear health pillar page for the complete picture of prevention, cleaning, and infection care.
What not to use
Despite popular home-remedy advice, the Merck Veterinary Manual specifically cautions against vinegar-based rinses in inflamed ears, noting they "can worsen swelling and secretions and increase infection risk," and that even products that are normally safe in a healthy ear can irritate one that is already inflamed.1 Hydrogen peroxide is not recommended either — it is more irritating to sensitive ear canal tissue than owners often assume, particularly when the skin barrier is already compromised. If your dog's ear looks red, swollen, or is causing obvious pain, skip both and see your veterinarian instead of experimenting further.
Safe vs. unsafe home approaches
| Approach | Status | Why |
|---|---|---|
| Vet-approved pH-balanced ear cleanser, used routinely | Safe for maintenance | Formulated for the ear canal's natural pH; helps manage wax and odour between vet visits |
| Thorough drying after swimming/bathing | Safe, recommended | Reduces the moist environment yeast and bacteria need to multiply |
| Cotton balls for wiping visible debris | Safe, vet-recommended | Removes loosened debris without pushing it deeper |
| Cotton swabs (Q-tips) | Avoid | Pack debris deeper into canal; risk of trauma to the eardrum |
| Diluted vinegar rinse | Avoid, especially if inflamed | Merck Vet Manual: can worsen swelling and secretions in an already-irritated ear1 |
| Hydrogen peroxide | Avoid | Irritating to sensitive ear canal tissue; not a recommended veterinary approach |
| Skipping the vet for a smelly, painful, or swollen ear | Avoid | Delays diagnosis of infections/mites that require prescription treatment |
When should I see a vet for ear scratching?
Book a vet visit promptly if you notice any of the following:
- A foul or musty odour coming from the ear
- Dark, waxy, yellow-green, or bloody discharge
- Swelling, redness, or visible pain when the ear is touched
- Head tilt, loss of balance, or unusual eye movements
- Scratching that has lasted more than a few days without improvement
- Recurring ear issues (a strong signal of an underlying allergy that needs its own workup)
A veterinary exam typically includes an otoscope check of the canal and eardrum and a cytology swab examined under a microscope — the only way to reliably confirm whether mites, yeast, bacteria, or a combination are present.1 Skipping this step and guessing at home risks treating the wrong problem while the real one progresses, and chronic untreated otitis can become a long-term, harder-to-resolve condition.
Supporting the skin barrier behind the ear
Because allergic skin disease is the most common underlying driver of recurring ear irritation, many dogs benefit from support that goes beyond the ear canal itself. A stronger, better-hydrated skin barrier is less reactive to allergens in the first place. Hydrolyzed collagen supplementation is one evidence-informed way to support that barrier over time, and pairing it with omega-3 fatty acids addresses systemic inflammation from the inside. Read more in our guide to improving your dog's skin health naturally.
Common mistakes dog owners make
- Treating the smell instead of the cause. Masking odour with scented products doesn't resolve the yeast, bacteria, or allergy driving it.
- Using leftover prescription drops from a previous infection. Different organisms need different medications; the wrong drop can let the real problem worsen.
- Reaching for vinegar or peroxide on a painful ear. As above, this can intensify inflammation rather than calm it.
- Cleaning too aggressively during a flare-up. Vigorous cleaning on an already-inflamed canal increases irritation; gentle handling matters most when the ear is sensitive.
- Assuming one ear infection means the mystery is solved. If ear issues recur, the underlying allergy — not just the ear — needs attention.
What to expect with a consistent care routine
Timelines vary by cause and severity, and active infections always need veterinary treatment first. As a general guide for maintenance once any infection is resolved and cleared by your vet:
- Within the first week: Less visible wax buildup and reduced odour with consistent, gentle cleaning.
- By 2–4 weeks: If allergies are a contributing factor, skin-barrier support (collagen, omega-3s) combined with routine ear maintenance may correspond with fewer flare-ups, though individual response varies.
- Ongoing: Dogs prone to ear issues typically need lifelong maintenance — regular cleaning, drying after swimming, and monitoring — rather than a one-time fix.
These are general patterns reported in veterinary care contexts, not guarantees, and any new or worsening signs should be reassessed by your veterinarian rather than "waited out."
Myth vs. fact
| Myth | Fact |
|---|---|
| "A smelly ear just needs a stronger cleaner." | Odour usually signals yeast or bacterial overgrowth that needs veterinary diagnosis and, often, prescription treatment — not just more cleaning. |
| "Vinegar rinses are a safe natural fix for any ear itch." | Merck's Veterinary Manual specifically warns against vinegar mixtures in inflamed ears because they can worsen swelling and secretions.1 |
| "Only puppies get ear mites." | Mites are more common in puppies but can affect dogs of any age, especially with exposure to other animals. |
| "If my dog isn't in pain, it's not serious." | Yeast overgrowth and mild allergic otitis often cause itching without dramatic pain, but left untreated they can progress to more painful, harder-to-treat chronic disease. |
Related reading
- Dog ear health — our complete pillar guide to cleaning, infections, and prevention.
- Dog ear and eye cleaner — building a routine that actually prevents problems.
- Dog ear yeast infection guide — signs, causes, and treatment of Malassezia otitis.
- Dog eye infection warning signs — related care for dogs with both ear and eye irritation.
Frequently asked questions
Why is my dog scratching his ears?
Ear scratching is a symptom, not a diagnosis. The most common causes are environmental or food allergies, yeast (Malassezia) overgrowth, bacterial infection, ear mites, or moisture trapped in the canal after swimming or bathing. A veterinary exam with ear cytology is needed to confirm which is present.
What's a good dog ear scratching remedy?
For a healthy ear that just needs maintenance, a vet-approved, pH-balanced ear cleaner for dogs used routinely, plus thorough drying after swimming, can help manage wax and odour. If an infection or mites are confirmed, a veterinarian will prescribe the appropriate antifungal, antibacterial, or antiparasitic treatment — there is no natural remedy that reliably replaces this.
Why does my dog keep shaking his head and scratching his ears?
Head shaking combined with scratching typically indicates active irritation or discomfort inside the ear canal — from allergies, infection, mites, or trapped debris. Persistent head shaking is one of the clearer signs that a vet visit, rather than home care alone, is warranted.
Is there a natural remedy for dog ear itch that's actually safe?
Gentle, routine cleaning with a proper canine ear solution and good drying habits are the safest "natural" steps you can take consistently. Popular home remedies like vinegar or hydrogen peroxide are not recommended by veterinary sources for inflamed ears, since they can increase irritation rather than resolve it.
How can I tell if it's ear mites or an infection?
Ear mites typically produce a dry, dark, crumbly, coffee-ground-like discharge with intense itching. Yeast infections tend to show waxy brown-to-yellow discharge with a musty smell. Bacterial infections often bring yellow-green, more liquid discharge and more pain on touch. Because these overlap, a microscope exam by your veterinarian is the only reliable way to confirm which is present.
When should I take my dog to the vet for ear scratching?
See your vet if you notice foul odour, dark or bloody discharge, swelling, pain when the ear is touched, head tilt or balance issues, or scratching that persists beyond a few days. Recurring ear problems also warrant a visit to investigate an underlying allergy.
Scientific references
- Merck Veterinary Manual. Ear Infections and Otitis Externa in Dogs. Reviewed/Revised Apr 2026. merckvetmanual.com
- Saridomichelakis MN, Farmaki R, Leontides LS, Koutinas AF. Aetiology of canine otitis externa: a retrospective study of 100 cases. Vet Dermatol. 2007. PubMed 17845622
- Layne EA, DeBoer DJ. Malassezia otitis outcome in 59 dogs. Vet Dermatol. 2021. PubMed 34189776
- Chen TA, Hill PB. The biology of Malassezia organisms and their ability to induce immune responses and skin disease. Vet Dermatol. PMC5603939
- Western College of Veterinary Medicine, University of Saskatchewan. Otodectes cynotis. wcvm.usask.ca
Veterinary disclaimer: This article is for general educational purposes and is not a substitute for professional veterinary diagnosis or treatment. Ear scratching can have several underlying causes that look similar but require different treatments. If your dog shows signs of pain, odour, discharge, swelling, or persistent scratching, consult your veterinarian promptly.