Dog Health
Yeast Ear Infections in Dogs UK — Signs, Causes & Treatment
Published Last updated 2 min read
Quick answer
Yeast ear infections in UK dogs cause head shaking, scratching and a characteristic yeasty smell with brown waxy discharge. They are usually secondary to allergies or moisture. See your vet for diagnosis — do not use human ear drops or insert cotton buds deep into the canal.
Signs of yeast otitis in dogs
- Frequent head shaking or tilting
- Scratching at one or both ears
- Strong yeasty or musty odour
- Brown, waxy or greasy discharge
- Red, inflamed ear flap or canal
- Pain when the ear is touched
- Thickened, darkened ear canal in chronic cases
Yeast infections often occur alongside bacterial otitis. Your vet identifies the organisms with a simple ear swab examined under a microscope.
Why yeast grows in dog ears
The canine ear canal is warm and L-shaped — ideal for Malassezia yeast when conditions favour overgrowth:
| Trigger | Why it matters |
|---|---|
| Allergies | Leading cause of chronic ear disease in UK dogs |
| Moisture | Swimming, bathing without drying ears |
| Anatomy | Floppy ears (Spaniels, Bassets) trap heat and debris |
| Hormonal disease | Hypothyroidism predisposes to skin and ear problems |
| Ear mites | More common in puppies; cause inflammation |
How vets diagnose and treat yeast ear infections
Your vet examines the ear with an otoscope, checks the eardrum, and takes a swab for cytology. This confirms yeast, bacteria or mites and guides treatment.
Typical treatment includes:
- Professional ear cleaning — removes waxy debris (sometimes under sedation if painful)
- Topical antifungal drops — prescribed for the specific infection
- Oral medication — for severe or deep infections
- Allergy management — if allergies drive recurrence
Finish the full course even if the ear looks better within days. Stopping early is a common reason infections return.
Prevention for UK dogs
- Dry ears thoroughly after swimming or bathing
- Clean only as directed by your vet — over-cleaning irritates healthy ears
- Manage underlying allergies with your vet's guidance
- Check ears weekly for redness, odour or discharge
- Never use cotton swabs deep in the canal
Schedule a recheck if symptoms return within weeks of finishing treatment.
When to see your vet urgently
- Sudden head tilt with balance problems (may indicate inner ear involvement)
- Swollen ear flap (aural haematoma — needs prompt treatment)
- Bleeding from the ear canal
- No improvement after five days of prescribed treatment
Sources & further reading
Facts in this guide are rewritten in plain English from publicly available UK advice. We name the organisation where a specific point comes from their guidance. Links below go to the original pages — use them to read the source material directly.
PETHEALTH+ is independent. These organisations do not sponsor, approve, or partner with this website. Guidance checked against sources listed below (last updated 2026-06-25).
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Frequently Asked Questions
- How do I know if my dog has a yeast ear infection?
- Common signs include head shaking, ear scratching, a strong yeasty or musty odour, brown waxy discharge and red inflamed ear canals. One or both ears may be affected.
- What causes yeast infections in dog ears?
- Malassezia yeast overgrows when the ear environment becomes warm and moist — often due to allergies, swimming, floppy ear anatomy or underlying bacterial infection. Allergies are the leading underlying cause of chronic yeast otitis.
- Can I treat yeast ear infections at home?
- Over-the-counter drops rarely resolve yeast otitis and can mask deeper problems. Your vet should examine the ear, identify yeast on cytology, and prescribe appropriate antifungal treatment.
- Why do yeast ear infections keep coming back?
- Unresolved allergies, incomplete treatment courses, or underlying hormonal disease cause recurrence. Long-term management often requires allergy control alongside ear cleaning protocols.