Aural hematomas are puffy pockets of blood

I always thought that aural hematomas (blood pockets in the ear flap) were the curse of floppy-eared dogs. Then I saw one in a German Shepherd Dog. Still, I was sure that these annoying complications were limited to dogs – until I saw one in a cat. So, what causes these big, puffy blood pockets that owners despise so much?

How hematomas form: Many people are familiar with the concept of a blood blister, like the kind you get when you pinch your finger in a door or pair of pliers (or am I the only clumsy one?). Aural hematomas are very similar to these blood blisters. They form when an ear vein is damaged and leaks blood under the skin of the ear flap. The pressure of the blood against the skin causes a pocket to form, which allows more blood to leak from the vein. This vicious cycle continues, sometimes until all available space has been used, leaving the ear very puffy and heavy. At this point, pressure or trauma may cause a small opening in the ear flap, allowing blood to ooze, pour, or otherwise escape into the environment. More typically, however, the owner is able to get the pet veterinary care while the blood is contained. More

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