Signs? such as shaking or scratching?, discharge (color of discharge)?, Any bleeding? Any swelling to the ear flap?
When did signs first occur?
Any previous ear infections or ear hematoma?
Indoor only or indoor/outdoor?
Is pet on heartworm/flea/tick prevention? What brand?
When was last dose given?
Is pet licking at paws or itching?
Does pet go to a groomer? If so, when was the last visit to groomer? Were ears plucked?
Is there a seasonal pattern to the ear infections?
Is pet on any ear medications currently? Do you use an ear flush regularly?