We have two doxies. The smaller one's ears were so bad, the vet thought he had ear mites because the gunk was so black. It was not, it was a yeast infection. So we were given a ointment. It did the trick..but not a complete fix. So weekly we had to treat his ears, for over a year. The vet had us switch his food to LAMB and RICE. We treated his ears the day we switched his foods (2 months ago) and have not treated him since. He also had skin issues in his under arm areas, then his little sack got raw also. Everything has since cleared up. We found out the number three items for allergies in dogs is, beef, chicken and dairy.