I HAVE A 6 YR OLD STAFFORD SHAR TERRIER AND FOR THE PAST MONTH SHE HAS BEEN SCRATCHING AT HER EAR SHE HAS SINCE LOST ALL THE HAIR ON ONE EAR SHE THEN STARTED TO GET CRUSTY EYES AND NOW SHE HAS STARTED TO CHEW HER BEHIND I HAVE TRIED THE BORAX AND PER...