Cleaning your dog's ears with cleaners containing alcohol or hydrogen peroxide is not recommended as these substances may irritate your dog's ear canals and eardrums. Alcohol is volatile and may cause discomfort and pain in the ear canal, especially if your dog's ear canals are narrow or inflamed, and its use may lead to drying of the ear canal or even damage to the eardrum. Hydrogen peroxide, on the other hand, may cause burns to the tissues within the ear canal, especially if your dog has an open wound in the ear canal, and its use may exacerbate the damage. Therefore, in order to protect the health of your dog's ears, you should choose a pet-specific mild ear wash for cleaning.