Add Yahoo as a preferred source to see more of our stories on Google. If you were to ask strangers on the street, 'What's one sign of a happy cat?' almost everyone would think of purring. While it's ...

If you were to ask strangers on the street, 'What's one sign of a happy cat?' almost everyone would think of purring. While it's true that purring is a sound of contentment among felines big and small ...