Hematoma of the Dog's Ear (Blood-Filled Ear Swelling)
A hematoma of the ear is a blood-filled pocket that forms within the thickness of the ear flap, usually on the inner surface. The ear swells like a soft, tense cushion. It almost always appears in a dog that has been shaking its head vigoro...
What is it?
A hematoma of the ear is a blood-filled pocket that forms within the thickness of the ear flap, usually on the inner surface. The ear swells like a soft, tense cushion.
It almost always appears in a dog that has been shaking its head vigorously or scratching at the ear forcefully. These repeated movements rupture small blood vessels in the ear flap, and blood accumulates.
The cause of this head shaking is most often an ear infection or allergy affecting the ears. Treating the blood pocket alone is not enough: the underlying problem that triggered the head shaking must also be addressed, otherwise the hematoma will return.
Commonly observed signs
These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.
Related signs — each one links to its page:
The ear flap suddenly becomes swollen, soft to the touch, as though filled with fluid, usually affecting only one ear.
The ear feels heavier, hangs differently, or is carried in an unusual position.
Head shaking and ear scratching, often present before the swelling appears.
Signs of an active ear infection: redness in the ear canal, discharge, or a foul odor.
Without treatment, the swelling gradually hardens and the ear shrinks and becomes deformed.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
The blood comes from small vessels in the ear flap that rupture due to vigorous head shaking or scratching.
The underlying cause is almost always itching or pain in the ear: external ear infection, allergy affecting the ears, or less commonly a foreign object such as a grass awn or ear parasites.
A direct blow to the ear can also be responsible.
External ear infection, especially when it persists or recurs.
Atopic dermatitis or food allergy affecting the ears.
Anything that causes repeated head shaking.
Any dog can develop a hematoma; those with recurring ear problems are at highest risk.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
Your veterinarian examines the ear flap and confirms it contains a fluid pocket.
The inside of the ear canal is examined with an otoscope to look for ear infection, foreign objects, or parasites.
A sample from the ear canal, viewed under a microscope, helps determine the right treatment for the infection.
If your dog scratches elsewhere on its body, an allergy is investigated.
Treatment
Treatment has two parts that work together: draining the blood pocket and treating the cause.
The pocket can be drained with a needle, but it often refills; your veterinarian may place a small drain or perform surgery.
Surgery involves opening the pocket, draining it, and stitching the two layers of the ear flap back together so they heal without a gap. The ear may be protected with a bandage during healing.
Anti-inflammatory medications may support treatment when prescribed.
The underlying ear infection or allergy is treated at the same time; a collar can prevent your dog from scratching.
Never drain the pocket yourself: infection is a real risk and it will refill.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Have any ear infection treated promptly and attend all follow-up appointments, even if your dog seems to have recovered.
Contact your veterinarian as soon as your dog shakes its head or scratches its ear repeatedly.
In allergic dogs, managing the allergy helps prevent ear scratching episodes.
After walks through dry grass, check your dog's ears for grass seeds.
Possible complications
The ear becomes permanently shriveled and deformed, known as "cauliflower ear," when the pocket is untreated or treated late.
The blood pocket returns if the underlying ear infection or allergy is not treated.
Infection of the pocket, especially if it was drained without proper precautions.
A deformed ear may have a narrower canal, which makes new ear infections more likely.
When to see a veterinarian
The ear flap swells suddenly like a pillow: contact your veterinarian within the next few days, as delay increases the risk of permanent deformation.
Your dog constantly shakes its head or scratches its ear.
The ear smells bad, is draining, or is very red inside.
Your dog loses balance or holds its head tilted to one side: seek care immediately.
A blood pocket that was already treated returns.
Prognosis
When treated early and the underlying cause is addressed, a blood pocket of the ear generally heals well.
The ear may retain mild deformation, particularly if treatment was delayed.
Recurrence is mainly linked to an untreated or uncontrolled ear infection or allergy.
Frequently asked questions
Hematoma or Otitis: How to Tell the Difference?
In otitis, the interior of the ear canal is red, dirty, or foul-smelling; the ear flap itself is not swollen. In an aural hematoma, the ear flap swells like a soft cushion. The two often occur together: otitis causes head shaking, and the shaking triggers the aural hematoma.
Can the swelling disappear on its own?
It may eventually resorb on its own, but slowly, and the ear then heals by shriveling. Rapid management limits this deformation and allows the underlying cause to be treated at the same time.
Why does a hematoma recur after being drained?
A simple puncture often leaves a space that refills. And if the dog continues to shake its head because of an ear infection or allergy, new bleeding occurs. Hence the benefit of drainage or surgery, and treating the underlying cause.
Is it painful for my dog?
A swollen ear is heavy and uncomfortable, and the ear infection that often accompanies it can be painful. If your dog refuses to have its head or ear touched, report this to your veterinarian.
References
Content reviewed by the TunisieVet editorial team · Updated 11 October 2026
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