Our German Shepherd is the same way. We figured out through food choices that he allergic to many of the foods that have fillers. We had to put him on Taste of the Wild which has helped. Along food allergies he has seasonal allergies too. This week it was a yeast infections so the vet said to use the ear antibiotics in the jowl area of his mouth and ears. The vet thinks our dog when scratching his mouth then ear is transferring the yeast into the ear causing the infection. sounds weird I know . We also give him Benadryl too. Just some options to discuss w/ your vet.