All I can say is...I have an australian shepherd that has always had really bad ear and teeth problems, even when he was very young. His ears were very sensitive, had the dark wax, and he would always shake his head... No matter how much I tried treating and cleaning his ears. ..His teeth were starting to look like a 12 year olds teeth by the age of 2 years...We had him on the best commercial dog food I could find, or I made him homemade food...Nothing helped until I put him on a 100% raw meat, bones, and egg diet....His ears look completely clean and healthy now, and his teeth look better than they ever have. ..I also have an older great pyrenees who always had ear problems..She was becoming deaf. ..But since switching to raw, her hearing seems to have gotten better, and she doesn't shake her head anymore.