What the dog knows: scent, science, and the amazing ways dogs perceive the worldA New York Times bestselling book about the extraordinary abilities of man's best friend. When Cat Warren adopted Solo, an unruly German shepherd puppy, she soon began to wonder what she'd let herself in for. Solo's boundless energy was what made him lovable, but it also made him exhausting and difficult to train. Then she struck upon an idea: what Solo needed was something to do. Like many dogs, Solo was destined to work, using his nose to help the