The short answer
An occasional head shake is normal — clearing water, dust, or an itch. But frequent or vigorous head-shaking usually points to an ear problem: infection, mites, allergies, trapped water, or a foreign object. Persistent shaking warrants a vet check.
Head shaking is the behaviour owners are most likely to dismiss and least likely to get away with dismissing. An occasional shake after a bath is nothing. Repeated head shaking is one of the clearest signs of ear disease there is, and ear disease in dogs is painful.
The harmless version
Dogs shake to remove water, dust and loose hair from the coat and ears. After a swim, a bath, or a walk in the rain, a few vigorous shakes are simply a dog drying itself.
Dogs also use a full-body shake to discharge tension — the shake-off you see after stepping down from an examination table or after an encounter with a strange dog. That is a normal, healthy reset and has nothing to do with the ears.
The distinguishing feature is frequency. One or two shakes and done is fine. Repeated shaking through the day is not.
Otitis externa is the usual answer
Infection of the external ear canal is described by veterinary sources as one of the most common infections seen in dogs, and head shaking is among its cardinal signs — alongside scratching, odour, discharge, redness and pain.
The mechanism is straightforward: debris and fluid accumulate in the canal, and the dog shakes and scratches trying to clear them. It rarely works, and the shaking itself can cause further problems.
What to look and smell for:
- Redness inside the ear flap or down the canal.
- A yeasty, sour or sweetish smell — often noticeable before anything is visible.
- Brown, black or yellow discharge, or a waxy build-up.
- Scratching at the ear, or rubbing that side of the head along furniture and carpet.
- Sensitivity when the ear base is touched, or a yelp when you handle it.
- A head tilt held toward the affected side.
Why it keeps coming back
This is the part most owners are never told. Ear infections in dogs are usually secondary. Something disrupted the ear environment first, and bacteria or yeast moved into the opening.
- Allergic skin disease — environmental or food. This is the most common underlying cause by a wide margin, and recurrent ear infections plus itchy paws is a classic allergic pattern.
- Ear anatomy. Floppy ears and hairy canals trap moisture and reduce airflow, which is why some breeds are chronically affected.
- Water. Swimming and bathing without thorough drying.
- Ear mites, more common in puppies.
- Foreign bodies — grass seeds especially, which burrow and often need removing under sedation.
- Endocrine disease, including hypothyroidism.
- Masses or polyps in the canal.
A dog on its third course of ear treatment in a year does not have three infections. It has one unaddressed underlying cause, and the productive question to ask your vet is what that is.
The complication worth knowing about
Vigorous, sustained head shaking can rupture blood vessels in the ear flap, producing an aural haematoma — a soft, fluid-filled swelling of the pinna. It is uncomfortable, it usually needs treatment, and it can leave the ear permanently thickened or crumpled if untreated.
It is entirely preventable by treating the ear problem promptly rather than waiting to see whether the shaking settles.
Do not clean first, examine first
The instinct is to reach for ear cleaner. Do not, if this is new or the ear looks sore. If the eardrum is ruptured — which happens with untreated infections — some cleaners and medications can reach the middle ear and cause serious damage, including hearing loss and balance problems. A vet needs to look down the canal with an otoscope before anything goes into it. The same applies to leftover medication from a previous episode.
When to see a vet
Book an appointment for
Repeated head shaking over more than a day; any smell, discharge, redness or swelling; scratching at the ear or rubbing the head on furniture; pain when the ear is touched; a head tilt; or a soft swelling developing in the ear flap, which suggests an aural haematoma. Seek prompt care for head shaking with loss of balance, circling, falling, or rapid flicking eye movements — that combination suggests middle or inner ear involvement rather than a simple outer ear infection, and it needs different treatment.
Ear infections do not reliably resolve on their own, they are painful, and the longer they run the more likely the canal is to thicken and narrow permanently. This is one of the genuinely worth-going-early conditions.
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Frequently asked
Why does my dog keep shaking his head?
Repeated head shaking is one of the cardinal signs of otitis externa, an infection of the external ear canal, which veterinary sources describe as one of the most common infections in dogs. Look for redness, a yeasty or sour smell, discharge, scratching or sensitivity when the ear is touched.
Is occasional head shaking normal?
Yes. Shaking to clear water after a bath or swim is normal, and the full-body shake dogs use to discharge tension after a stressful moment is healthy. Frequency is the distinguishing feature — one or two shakes is fine, repeated shaking through the day is not.
Why do my dog's ear infections keep coming back?
Because they are usually secondary. Allergic skin disease is the most common underlying cause by a wide margin, followed by ear anatomy, trapped water, mites, foreign bodies and endocrine disease. Three treatment courses in a year means one unaddressed cause, not three infections.
Can I clean my dog's ears myself?
Not before a vet has examined them if this is new or the ear looks sore. If the eardrum is ruptured — which happens with untreated infections — some cleaners and medications can reach the middle ear and cause serious damage including hearing loss and balance problems.
What is an aural haematoma?
A soft, fluid-filled swelling of the ear flap caused by ruptured blood vessels from vigorous head shaking. It is uncomfortable, usually needs treatment, and can leave the ear permanently thickened or crumpled. It is preventable by treating the ear problem promptly.
When is head shaking urgent?
When it comes with loss of balance, circling, falling or rapid flicking eye movements — that suggests middle or inner ear involvement rather than a simple outer ear infection and needs different treatment. A developing swelling in the ear flap also warrants prompt attention.
Sources
Every claim on this page is checked against published veterinary and animal-behaviour research. Here’s where it comes from.
- 1Ear Infections in Dogs (Otitis Externa) — VCA Animal Hospitals
- 2Dog Ear Infections: Symptoms, Causes, Treatment, and Prevention — American Kennel Club
- 3Tympanic Membrane Rupture and Middle Ear Infection in Dogs — VCA Animal Hospitals
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