Step 1 : Introduction to the question "2. Which one of these things might be described as dog-eared?"
...1. A red-headed female 2. A soup tureen 3. An old book 4. A television set A dog-eared book is one that has the top corners turned down to mark the page where the reader was when they laid the book down. It infers that the book is old, possibly well-read, and not in taken good care of. It also denotes the lack of use of a proper book marker.