If your dog has ear problems, you can use THORNIT

This old-fashioned canker powder is the best remedy ever for dirty and smelly ears and ear mite problems. We wouldn't be without it! If your dog has sore ears AND chews his feet, then you need to use Thornit in the ears and on the feet. It is completely safe to use, and you will be amazed by the result. It is also safe for use on cats, rabbits, guinea pigs,

Thornit can be obtained from  Champion Pet Supplies