My year old Pittbull, Cali has consistent issues with yeast infections in her ears. We have tried everything to keep her ears clean and dry but still have an issue. She has been prescribed Mometamax by our vet but my concern is that if we continuely use this med. she will either become immune or possibly have worse side effects. Does anyone have advice on a more natural way to keep her ears healthy? And/Or is it healthy to continue to to give it to her?