It's incredible how well our kitties know these things! From the very first time I held him, Groucho has always gone to my left shoulder without exception. Due to a hearing loss, I had to get a hearing aid for my right ear. When I came home from the doctor the day I got it, Groucho came up and went straight to my right shoulder! He NEVER did that before. He purred and several times gently touched my right ear with his paw. My audiologist is owned by a cat and I told her about it thinking there might be some high range sound Groucho was hearing that is beyond human range. She said that my hearing aid doesn't do that but Groucho sensed something was different. This is one of the countless reasons why we love our kitties so much!!!!!