It's a truth universally acknowledged that dogs are man's best friend, but they can also save lives, help the sick, and fight crime. Included here are true stories of such remarkable dogs as Charco, the veteran sniffer dog; Daisy, the tiny Dachshund who put her life on the line to protect her humans from a bear; Whizz, the Newfoundland who works as a freelance lifeguard; and Delta, who saved her young owner from a volcano—after already having saved his life three times.