Dog Ear Infection: Signs, Causes & When to See a Vet
Monitor closely
Quick answer
Dog ear infections typically cause head shaking, scratching, odor, and discharge. While mild cases may improve with cleaning, persistent or painful symptoms need veterinary treatment to prevent complications like hearing loss.
Common causes
Yeast overgrowth
Malassezia yeast naturally lives in ears but can multiply excessively in warm, moist environments, causing brown discharge and a musty odor.
Bacterial infection
Bacteria like Staphylococcus or Pseudomonas can invade the ear canal, especially after moisture gets trapped from swimming or bathing.
Ear mites
Tiny parasites more common in puppies cause intense itching, dark crumbly discharge, and are highly contagious between pets.
Allergies
Food or environmental allergies inflame the ear skin, creating conditions where infections thrive—often affecting both ears repeatedly.
Foreign bodies or growths
Grass seeds, dirt, or tumors can lodge in the canal, causing irritation, blockage, and secondary infection.
When to see a vet
- Severe head tilting or loss of balance
- Swelling or redness spreading to the ear flap
- Foul-smelling pus or blood discharge
- Your dog cries or snaps when ears are touched
- Sudden hearing loss or unusual eye movements
Home care tips
- Gently wipe visible outer ear with a vet-approved cleaner—never insert cotton swabs into the canal
- Keep ears dry after bathing or swimming
- Apply any prescribed medication exactly as directed
- Prevent scratching with an Elizabethan collar if needed
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FAQ
Can a dog ear infection go away on its own?
Mild irritation might resolve, but true infections usually worsen without treatment. Untreated infections can spread to the middle ear, cause hearing damage, or create chronic pain.
What does dog ear infection discharge look like?
Yeast infections often produce brown, waxy debris with a musty smell. Bacterial infections may show yellow or green pus. Ear mites create dark, coffee-ground-like material.
How do vets diagnose ear infections?
Vets examine the ear canal with an otoscope, take samples for microscopic evaluation, and may culture bacteria to identify the exact cause and best antibiotic.
Can I use hydrogen peroxide or vinegar to clean my dog's ears?
Avoid these—they can irritate damaged tissue and worsen pain. Use only veterinary-formulated ear cleaners designed for safe pH balance in canine ears.
Why does my dog keep getting ear infections?
Recurrent infections often signal underlying allergies, anatomical issues like narrow canals, or hypothyroidism. Your vet may recommend allergy testing or long-term management plans.