---
title: "Yeast Ear Infections in Dogs UK"
description: "Brown smelly ear discharge in dogs often signals yeast otitis. UK guide to Malassezia ear infections — causes, vet treatment and prevention."
url: "https://pethealth.org.uk/health/dog-yeast-ear-infection-uk"
canonical: "https://pethealth.org.uk/health/dog-yeast-ear-infection-uk"
date_published: "2026-06-25"
date_modified: "2026-06-25"
source: "PETHEALTH+"
---

# Yeast Ear Infections in Dogs UK

**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

## FAQs

### 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.

## Sources

- [PDSA — Ear problems in dogs](https://www.pdsa.org.uk/pet-help-and-advice/pet-health-hub)
- [Blue Cross — Dog health](https://www.bluecross.org.uk/pet-advice)
- [BVA — Advice for pet owners](https://www.bva.co.uk)

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Last modified: 2026-06-25