My dog george is a lab cross rott,he will be 17 in June,he is fighting fit and goes for a run every day,he started shaking his head a few weeks ago and I was advised by pet shop to put some drops in to soften wax.he was a little hard of hearing before but since I put these drops in he seems tone deaf.he gets very upset when going to the vets so I want to use this as last resort! Any advice?