
My rescue dog (lab cross) started to suffer with the 1 ear very badly when he was about 7 yrs old, the vet would just always treat the ear and didn't seem interested in finding the cause (other than telling me it was dirty ears that caused it). I was convinced it was related to food, after a few months of trying different food i found that within 2 hours of him eating anything containing chicken, his ear would start to go red & itchy. Simply by stopping him having chicken he hasn't needed AB's for a bad ear in a few years now (it was happening every few weeks), he gets a bit itchy every now & then (lasting for a couple of hours) & I'm sure it's down to further food sensitivities so I just know not to feed him that food again. I am amazed at the effect a chicken-free diet has had (well, no chicken, turkey or pork), the poor thing would get so bad before that his head would be tilted on 1 side and there would be a huge fluid swellling under his ear & neck :(
Best of luck getting to the bottom of Dillons problem, it's horrible seeing them crying and rubbing thier ears all over the floor.