The dog or cat has a liquid-filled lump on the ear flap. There are many things that can cause swelling of the ear flap in pets; however, the most common causes are hematomas. Hematomas develop when blood vessels within the ear flap rupture. Other reasons that dogs and cats may experience swelling of the ear flap include ear mites, inner or outer ear infections, fly bites, bee stings, flea allergy and injuries to the ear.
Swelling of the Ear Flap Affects