Shelley, Cyril's Pet-Parent, tells us, "Cyril the Otterhound has had stinky, gunky ears since he was a puppy. I have tried the homemade mixture recommended by other Otterhound owners and have tried zymox and had prescriptions from the vet. None of those things worked for any length of time. I'm thrilled with EcoEars and how it has kept his huge ears clean and not stinky. I highly recommend this product and so does my Big Boy, Cyril."