Thanks to all who participate in the topic. Long story short, my minituare german schnauzer is 3 years old. For the longest time know he scratches at his ears and in the middle of the night he is constantly scratching at both ears. Our vet said he may have a "yeast infection" and contnues to give us pills and eardrops. The problem is that it seems like a temporary solution, when it does work. Now our groomist mentioned that there is a supplement that you put on the dog's food and it is supposed to eliminate the yeast. There is also a FOUL order coming from his ears, kind of like a bitter vinegar smell. How do I get rid of this for good, as it has been going on for months now and I feel very sorry for the dog??? Please Help.