We have a beagle-pointer mix who has been shaking her head incessantly and scratching her left ear. A while ago, we took her to the vet, who looked at the ear and told us it was fine. Our dog, though, scratches it until the ear bleeds. The ear itself is very red and a bit scabby, probably from scratching. I can't really detect evidence of ear mites. We have been cleaning her ears about 3 times a week with cleaning solution, though, just in case. I think she also might have polyps in the outer part of her ear.
Does anybody have any experience with anything like this?