could be mites could be a yeast infection along with it . after you clean it out good with the peroxide solution mix you some vinegar in warm water and soak it's ear canal good for several days . next time you are out and about get your hands on some [ Deep Swamp Ear Remedy ] thats what i use on a regular basis . this ol stuff is sulfer based and works .
Deep Swamp Ear inc. 870-291-3227 501-454-6640
DeepSwampEar@yahoo.com our dogs ears are the most neglected part on our dogs , till the head shakin starts going on , check them ears regularly !!!