All owners would love to communicate better with their pets, but all of us have our physical shortcomings. Cats can't talk, and humans lack the expressive ears and tail movements used by cats to show their moods. I'm told that to horses, humans appear permanently aggressive because our ears "aren't sticking up in a friendly manner". Similarly, your cat must gaze at your "ear-less" face, wondering what on earth you're thinking. Large, artificial cats' ears can be fitted to the owner's...