I aggressively with the advice you have received so far. If nothing turns up maybe you could put up gates to keep him separate from the others?
I also have a grumpy ole man.. My lasha Sam who's 9 years old. When He gets really grumpy I check his ears ..he gets bad ear infections.
__________________ Shinja mom to  Remy  lil Sis to   Bailey and Sammy  |