Tom woke up to find his basset hound, Dudley, shaking his head so hard the tags on his collar rattled against the floor. One ear looked like a inflated water balloon — thick, warm, and drooping at an odd angle. Dudley kept scratching at it, and the ear felt soft and fluid-filled when Tom touched it gently. He had never seen anything like it, but a quick search confirmed his suspicion: this was almost certainly an ear hematoma.
Key points at a glance
- A swollen, fluid-filled ear flap is commonly an aural hematoma
- Hematomas form when blood vessels rupture from head shaking or ear scratching
- Underlying ear infections or allergies usually trigger the shaking
- Untreated hematomas often scar into a permanent "cauliflower ear"
- Treatment ranges from drainage and medication to surgical repair
What is an aural hematoma?
An aural hematoma is a pocket of blood that collects between the skin and cartilage of the ear flap (pinna). When a dog shakes its head violently or scratches persistently, small blood vessels in the ear break. Blood pools under the skin, causing swelling, warmth, and a floppy, heavy feeling.
The condition is painful. Dogs typically hold the affected ear down, tilt their head, and resist having the ear touched.
What causes dogs to shake their heads hard enough to cause this?
Hematomas are almost always secondary to something irritating the ear canal:
Ear infections (otitis externa) from yeast, bacteria, or mites cause intense itching and head shaking.
Allergies — environmental or food-related — create chronic ear inflammation that leads to repeated scratching.
Foreign bodies like grass seeds lodge in the canal and trigger frantic head shaking.
Ear mites are common in puppies and multi-pet households.
Treating the hematoma alone without addressing the underlying ear problem guarantees recurrence.
How is an ear hematoma diagnosed?
Your veterinarian can usually diagnose a hematoma on physical exam. The ear feels like a fluid-filled pillow, distinct from the firm swelling of an insect bite or the localized lump of an abscess. If the ear canal is also red, smelly, or full of debris, an ear infection is likely driving the problem.
What are the treatment options?
| Approach | Pros | Cons |
|---|---|---|
| Surgical repair | Lowest recurrence rate | Requires anesthesia, higher cost |
| Drainage + bandaging | Less invasive | Higher recurrence, bandage maintenance |
| Steroid injection | Simple, no surgery | Works best for small hematomas |
| Leave untreated | No upfront cost | Scarring, chronic pain, permanent deformity |
Most veterinarians recommend surgical correction for moderate to large hematomas. The procedure involves draining the blood, removing clots, and suturing the ear in a way that prevents re-filling. A bandage or Elizabethan collar keeps the dog from re-injuring the ear during healing.
Dudley's vet found a yeast infection in both ears, treated the infection, and repaired the hematoma in one procedure. Within two weeks, the swelling was gone and Dudley's head shaking stopped.
How do you prevent ear hematomas from coming back?
Keep ears clean and dry as your vet recommends. Treat ear infections promptly — do not stop medication early even if the ear looks better. Manage allergies with diet changes, medications, or environmental controls. Check ears weekly for redness, odor, or excessive wax.
When should you see the vet?
Schedule an appointment within 24 to 48 hours of noticing ear swelling. While not always a same-day emergency, hematomas worsen quickly and become harder to treat as blood clots organize. If your dog is in severe pain, bleeding from the ear, or has a fever, seek same-day care.
Frequently asked questions
Can a hematoma heal on its own? The blood may eventually reabsorb, but the ear cartilage often warps permanently, leaving a thickened, folded appearance called cauliflower ear.
Is head shaking without swelling still a concern? Yes. Persistent head shaking indicates ear discomfort and should be evaluated before a hematoma develops.
This article is for informational purposes only and does not replace professional veterinary advice. Ear swelling and head shaking require veterinary evaluation and treatment.