My Bailey has had ear yeast infections for 2 years I'd get medication and clean them and on on . In the last month for the first time she has no evidence of yeast no brownish stuff no bad smell and the only thing I am doing different is I changed her food to duck and potato and I give her a heaping serving spoon of plain nonfat yogurt. I will not let a day go by without giving Bailey and Baxter their yogurt. They think it is the biggest treat ever I buy it in the larger container for about $2. and it last the two of them a week. Pretty cheap preventative in my book not to mention it is good for the digestive system and to them it is like having ice cream.