Duke was constantly itching and blistering his skin because of how much he would gnaw at it. Instinctively, I assumed it was flees. HOWEVER, I could not find a flee anywhere! I spent hundreds of dollars on frontline and advantage, but he didn’t have flees so those medications weren’t really working. I tried OxyNu via a friends advice. Turns out Duke had allergies from his food and other things which was causing him to itch and chafe so bad. I used the Allergy Relief OxyNu and Duke literally stopped itching immediately! I no longer buy frontline and advantage due to the OxyNu working so well. I love this product and would recommend it to any pet owner!