Dog Ear Infection: Why the Ears Smell, Itch, or Keep Coming Back

Head shaking, ear scratching, redness, discharge, and odor are classic signs of an ear problem in dogs. Many owners assume the ear simply needs cleaning. Recurrent ear disease often has a deeper cause.

Why do dog ear infections happen? Yeast and bacteria can overgrow in an inflamed ear canal. Allergic skin disease is a common underlying trigger. Ear mites are possible, especially in younger animals. Swimming, excess moisture, ear anatomy, foreign material such as plant awns, and chronic skin disease can also contribute.

Why do infections keep returning? If the infection is treated but the allergy, moisture problem, foreign body, or chronic inflammation remains, the ear may relapse. Long-standing disease can cause the ear canal to become thickened and painful.

What does a veterinarian do? An otoscope may be used to look into the canal and assess the eardrum when possible. A sample of debris can be examined under a microscope to identify yeast, bacteria, and inflammatory cells. Very painful or severely blocked ears may require more intensive cleaning or sedation.

Treatment Treatment is selected based on what is found in the ear and whether the eardrum is intact. Chronic cases may also require allergy management and follow-up testing.

Do not pour alcohol, peroxide, essential oils, or random ear cleaners into a painful ear without veterinary guidance.

When is it more serious? Head tilt, loss of balance, abnormal eye movements, severe pain, or neurologic signs may indicate deeper ear involvement and should be evaluated promptly.