The deaf cat I took in last Sept ,was still shaking her head and digging at her ear so I took her to the vet . After tests, the vet said Toots had infections in both ears. For the past two weeks I have been putting drops in her ears twice a day, and I have to swab out the debris with Q tips every other day. Now, if you come up behind her and call her she turns around. I guess she couldn't hear because of the infection, and the crud that was packed in her ear canals. Woo Hoo, Tootsie can hear again.