Cats and dogs were once wild animals. Today, they are family members and surrogate children. A little over a century ago, pets didn't warrant the meager legal status of property. Now, they have more rights and protections than any other animal in the country. Some say they're even on the verge of becoming legal persons. How did we get here--and what happens next? In this fascinating exploration of the changing status of dogs and cats in society, pet lover and award-winning journalist David Grimm traces the rich and surprising history of our favorite companion animals, from their wild origins to their dark days in the middle ages to their current standing as the most valued animals on Earth.