Our Chihuahua developed itchy, discolored skin, and a thick waxy buildup in her ears when she was about six years old, possibly due to our very dry climate. Our vet prescribed this product. When it seemed to be working, we ran out and were very happy to find it at Vet Depot (for much less, too!). Part way through the second bottle, the problems disappeared. We've continued adding a few drops each day to her canned food to prevent recurrence, and after a year there has been none. Highly recommended!