Swollen ear flap (othematoma)
If the inner surface of the ear (usually, but not always, one side only) of your dog suddenly becomes swollen, then 99 times out of 100 it is because small blood vessels in the ear flap have ruptured and the blood has oozed out. After a while, there is an accumulation of serum and coagulated (clotted) blood within the ear flap. Since this mass cannot drain off,