Yeasty ears, itchy skin, and dry flaking skin are all allergy symptoms that are due to certain ingredients in pet foods. Groomers often notice these symptoms because they have to pay such close attention to a dog's ears, skin, and coat. Feeding your dog a high-quality diet can be beneficial to his appearance, but more importantly, to his overall health. When you learn how to read ingredient labels on dog foods, you will soon begin to understand how substandard many pet foods are.