Common causes of a swollen dog ear
A swollen ear can look dramatic, and the cause is not always obvious from the outside. Common possibilities include:
- Ear hematoma. A pocket of blood forms between the skin and cartilage of the ear flap, making it puffy and often soft or squishy.
- Ear infection. Inflammation inside the canal can cause swelling, redness, discharge, and odor.
- Allergies. Allergic reactions can make the ear red, itchy, and swollen. Our guide to helping an itchy dog covers common allergy triggers.
- Insect bites or stings. These can cause sudden localized swelling.
- Injury. Scratches, bites, or knocks to the ear.
- Foreign material or parasites. Grass seeds or mites can cause irritation that leads to scratching and head shaking.
Ear hematoma explained
An aural (ear) hematoma happens when small blood vessels in the ear flap break, usually after vigorous head shaking or scratching, and blood collects in the flap. The trigger is often something that makes the ear itchy or painful, such as an infection, allergy, or mites, which is why treating the underlying cause matters. The flap may feel warm, thick, or like a water balloon, and your dog may be uncomfortable.
Signs to look for
- A puffy, thickened, or ballooned ear flap
- Head shaking or tilting
- Scratching at the ear
- Redness, discharge, or odor
- Pain or sensitivity to touch
- A dog that resists having the ear handled
What to do right now
- Try to keep your dog from scratching or shaking the ear. A calm environment helps.
- Do not squeeze or press the swelling.
- Contact your vet to book an exam, and mention if there is pain, discharge, a head tilt, or sudden onset.
- If your dog seems very unwell, is in significant pain, or the swelling appeared fast after a sting with facial swelling or trouble breathing, treat it as an emergency and contact a vet immediately.
What not to do at home
- Do not try to drain the swelling yourself. This risks infection and injury, and it often refills.
- Do not give human pain relievers. Many are dangerous for dogs.
- Do not put home remedies in the ear without vet guidance, since an infected or painful ear can be damaged by them.
- Do not delay for days hoping it improves.
How a vet treats a swollen ear
Treatment depends on the cause. The vet will usually examine the ear, may look inside with an otoscope, and may take a sample to check for infection or mites. For a hematoma, options can include draining the swelling or surgical repair, along with treating the underlying cause such as an infection or allergy. Pain relief and anti-inflammatory medication prescribed by the vet may also be used. Simply draining it without addressing the cause can lead to it coming back.
Will a swollen ear heal on its own?
Some small hematomas may slowly reabsorb, but this can take time, be uncomfortable, and may leave the ear scarred or thickened. Because the cause often needs treatment as well, a vet visit is recommended rather than waiting.
Preventing a repeat
Keeping ears healthy reduces the head shaking that can lead to hematomas. Read our guide to how to prevent dog ear infections, and for yeast-related issues see preventing yeast infections in dogs’ ears. Avoid unproven home cleaners such as vinegar in a sore ear; our piece on the apple cider vinegar ear cleaner for dogs explains why.
When to see a vet
A swollen ear should be seen by a vet. Go sooner if there is severe pain, a head tilt, loss of balance, fever or lethargy, swelling of the face, or if your dog seems distressed.
FAQ
What can I give my dog for ear swelling?
Do not give medication from your own cabinet. Your vet can advise on safe pain relief and treatment.
What helps ear swelling go down?
That depends on the cause. Treating the infection, allergy, or hematoma is what reduces swelling.
Is a swollen ear painful for my dog?
It often is, even if your dog does not show it clearly.