Groom Professional Thornit Ear PowderGroom Professional Thornit Ear Powder 20g Thornit Ear Powder is used for ear mites and their complications such as itching in dogs, cats and small animals. Itchy ears are usually caused by an ear mite which also creates blobs of wax that can be seen in the ear. These blobs can also weep and smell. To Use: Simply sprinkle a small amount of Thornit ear powder onto the inside of the ear surface NOT the ear hole and massage in.