Your dog’s ears are an extension of your pet’s skin. The dog’s ear canal is divided into 3 sections: 1) the L-shaped external ear canal extends from the outside to the ear drum, 2) behind the ear drum lays themiddle ear (tympanic cavity), and lastly, 3) the inner ear. In contrast to people, the majority of ear problems in dogs occur in the external ear canal. Inflammation of the external ear canal, commonly caused by allergies, may result in bacterial and/or yeast infections. Left untreated, these infections may extend into the middle and inner ear cavities, causing loss of hearing and balance.