Dog scratching ears: when to wait, when to worry, when to call the vet

First decision: emergency, urgent, or wait-and-see

Emergency or near-emergency (vet ASAP, today):

• Sudden head tilt with balance problems, falling over, eyes flicking side-to-side (nystagmus). Could be inner ear infection or vestibular disease.
• Swollen ear flap like a balloon (aural hematoma: broken blood vessel from violent head shaking).
• Bleeding from the ear canal.
• Severe pain: yelps when touched, won’t let you near the head.
• Foreign object visible in the ear (grass awn / foxtail, common in summer in fields).

Urgent (vet within 24 to 72h):

• Persistent scratching at one or both ears for more than a couple of days.
• Smelly ears (yeasty bread smell or sour smell).
• Discharge: brown, black, yellow, or red.
• Repeated head shaking.
• Holding head tilted.
• Visible redness inside the ear flap.

Wait-and-see:

• Brief scratch after a bath (water in ears).
• Occasional scratch with no other signs, ears look clean and smell neutral.
• One-off head shake after waking up or coming inside.

Common non-emergency causes

• Brief scratch after a bath (water in ears).
• Occasional scratch with no other signs, ears look clean and smell neutral.
• One-off head shake after waking up or coming inside.

Common urgent causes (vet within 24 to 72h)

Otitis externa (outer ear infection): extremely common

Bacterial, yeast, or mixed infection in the outer canal. Brown waxy or yellow purulent discharge, smell, redness, scratching, head shaking. Any breed can get one, but VCA Animal Hospitals notes that dogs with large, floppy or hairy ears (for example Cocker Spaniels, Miniature Poodles, Old English Sheepdogs) are more prone. The Cornell Riney Canine Health Center adds dogs that swim, especially drop-eared breeds like Labradors and Golden Retrievers.

Needs vet. They’ll do an ear cytology, prescribe targeted treatment. Over-the-counter products are not always effective and can sometimes cause more inflammation in the ear canal (Cornell Riney Canine Health Center).

Ear mites

More common in puppies, outdoor dogs, and dogs that live with cats. Black coffee-ground debris in the canal, intense itch. Vet diagnosis (mites visible under microscope) and treatment.

Allergies (atopy or food)

Many dogs with environmental or food allergies show ear inflammation as a primary symptom. Recurring ear infections every few months → ask vet about allergy workup.

Polyps and tumors

Less common, more often in older dogs. Persistent unilateral discharge, sometimes blood. Vet exam.

Yeast overgrowth

Often secondary to allergies or moisture. Yeasty smell. Same vet workup as outer ear infection.

Common emergency causes

Foreign body (grass awn / foxtail)

Especially in summer, dogs who walk in tall grass / fields. Sudden, violent ear scratching, head tilting, sometimes after a walk. Vet visit, often need sedation to remove.

What to note for your vet

Things to check at home (gently)

These don’t replace a vet, just help you describe what you see.

1. Lift the ear flap. Smell it. Look at color (pink-grey is normal; angry red or dark is not).
2. Check the canal. Visible debris? Color of the discharge?
3. Watch the head shake pattern. Once-in-a-while or constant?
4. Compare ears. One ear or both? Asymmetry sometimes points to a foreign body or polyp.
5. Don’t deep-clean before the vet visit. Cleaning can change what the vet sees on cytology and can push debris deeper.

Things to note

• Frequency of scratching, head shaking.
• Which ear (if you can tell).
• Discharge color / smell / amount.
• Recent swims, baths, grooming, walks in tall grass.
• Recent flare-up of any other allergy signs (paw licking, belly redness, itchy face).

Have ready for the visit

• Past ear infections: date, side, treatment, what worked.
• Allergies (food, environmental).
• Ear-cleaning routine (how often, what product).
• Vaccination history.

If your dog has had ear infections before, the history helps the vet pattern-match to whatever cleared it last time, instead of starting over.

What not to do

• Don’t pour rubbing alcohol or hydrogen peroxide in the ear canal.
• Don’t use Q-tips inside the canal: they push debris deeper, risk eardrum damage.
• Don’t use leftover ear meds from a previous infection without checking with the vet: different infection, different treatment.
• Don’t assume an over-the-counter ear cleaner will fix an active infection. It usually won’t.

Related

• When to take your pet to the vet (pillar)
• Dog itching and scratching skin (often paired, allergy-driven)
• How to organize pet records
• Care plan feature
• Pet records feature