Ear infections — particularly middle and inner ear infections (otitis media / interna) — can be a source of neurological symptoms in dogs and cats. These can range from mild to severe, and even the most subtle of signs (like anisocoria or unequal pupil size of the eyes) can be an indicator of serious ear disease - including brain involvement. Dr. Rebecca Windsor - a veterinary neurologist - explains the condition, recommended diagnostics, and treatment options. This is an excerpt from Dr. Windsor's full webinar on feline neurologic problems: