An occasional head shake is completely normal — dogs do it to clear water, debris, or just because it feels good. But when a dog is shaking their head repeatedly, scratching at their ears, or tilting their head to one side, that's your signal something is wrong. In 2026, ear problems remain one of the most common reasons dogs visit the vet, and persistent head shaking is almost always a symptom worth investigating.
Common Causes of Head Shaking in Dogs
Ear Infections (Otitis Externa)
By far the most common cause. Ear infections in dogs are usually caused by bacteria or yeast (or both) and are often linked to underlying allergies. Signs include head shaking, scratching at the ear, a dark or yellowish discharge, unpleasant odor, and redness or swelling of the ear canal. If you've ever dealt with a dog ear infection, you know the smell is unmistakable — see our detailed guide on dog ear infection symptoms for what to look for.
Ear Mites
More common in puppies and cats but can affect dogs too. Ear mites cause intense itching and produce a dark, coffee-ground-like debris in the ear canal. Infected dogs shake and scratch constantly and may have raw skin around the ears from scratching.
Foreign Bodies
Grass seeds (foxtails in particular), small sticks, or debris can become lodged in the ear canal, causing acute, intense head shaking and pawing at one ear. This usually comes on suddenly after outdoor activity.
Aural Hematoma
A secondary complication of vigorous head shaking — when blood vessels in the ear flap rupture and fill with fluid, creating a soft, fluid-filled swelling on the ear flap. Hematomas are not an emergency but are uncomfortable and require veterinary drainage. They often form when ear infections go untreated.
Water in the Ear
After swimming or bathing, trapped water can cause temporary head shaking. This usually resolves quickly but can contribute to infection if moisture lingers.
Allergies
Food or environmental allergies in dogs frequently manifest as ear problems. Dogs with seasonal allergies often get recurrent ear infections — treating the underlying allergy is key to breaking the cycle.
Polyps or Tumors
Less common but worth mentioning — growths inside the ear canal can cause chronic shaking and should be ruled out if problems persist despite treatment.
When to Worry — Signs That Need Vet Care
See a vet if your dog is:
- Shaking their head persistently for more than a day or two
- Scratching at the ear until it bleeds
- Tilting their head to one side — this may indicate a middle or inner ear infection affecting balance
- Circling or losing balance — possible vestibular involvement
- Showing discharge, swelling, or strong odor from the ear
- Appearing painful when you touch or approach the ear
- Not eating or acting lethargic alongside ear symptoms
Emergency signs: Loss of balance, falling over, rapid eye movement (nystagmus), or severe neurological signs combined with head shaking require immediate veterinary evaluation (AAHA Canine Life Stage Guidelines, 2019).
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What to Do at Home
- Look gently in the ear — Use a flashlight to check for visible debris, redness, or discharge. Do NOT probe the ear canal.
- Smell the ear — A yeasty or bacterial odor is a reliable sign of infection
- Don't insert cotton swabs — This pushes debris deeper and can damage the eardrum
- Use vet-approved ear cleaner if your vet has recommended it previously for your dog's ear type
- Keep water out — Use cotton balls (not Q-tips) in the ears during baths if your dog is prone to infections
Still Not Sure if Your Dog Needs a Vet?
When you're not sure if this is wait-and-see or call-tonight, Voyage AI Vet triages in under 2 minutes. Describe what you're seeing in chat, share photos of what you're seeing — your dog's posture, any visible signs, and the affected area, or hop on a live video call if you want a second pair of eyes. Every answer comes with citations to the actual veterinary literature it's pulling from — so you see exactly where the guidance comes from, not just a chatbot's word.
Frequently Asked Questions
Q: Can I treat my dog's ear infection at home? A: Over-the-counter ear cleaners can help with mild cases, but true ear infections require prescription ear drops. Using the wrong product can worsen the infection or cause damage, so a vet exam is strongly recommended before treating.
Q: Why does my dog keep getting ear infections? A: Recurring ear infections in dogs almost always have an underlying cause — most commonly allergies (food or environmental). Without addressing the allergy, infections will keep coming back. Ask your vet about allergy testing.
Q: What does an aural hematoma look like? A: It looks like a soft, puffy balloon or pillow on the ear flap. It develops quickly (within hours) after vigorous head shaking and is usually warm to the touch. It requires veterinary draining and stitching.
Q: My dog is shaking their head but their ear looks clean — what could it be? A: A deeper middle ear infection (otitis media), foreign body deeper in the canal, or an underlying allergic reaction can cause head shaking without obvious external signs. A vet exam with an otoscope is needed to rule these out.
This article is for informational purposes only and is not a substitute for professional veterinary advice. Consult your veterinarian for diagnosis and treatment.