In dogs, those breeds with floppy ears are more prone, since air flow is limited and a warm, moist environment built up, which is conducive to infection.
The external ear in animals is longer and deeper than in humans, which makes it easier for infection or wax to build up or be hard to remove.
Infections can be caused by both bacterial and fungal origin, as well as small organisms such as ear mites.
Good care often involves cleaning the ear daily, to prevent build-up and bring the infection under control.
In more severe cases, ear cleaning under sedation or anesthesia may be required and evaluation for otitis media may be indicated.