My dog is three and she has had an ear problem ever since she was a little puppy. Its inflamed (red) looking, and sort of scaley, and it has a bad odor. It also sounds like liquid is possibly in the ear canal. I have tried all kinds of over-the-counter remedies, cleaned her ears with q-tips and everything I can think of. I have heard if its a yeast infection, I can put yogurt in there and the enzymes will eat the yeast, but is that really healthy?