Since humans first domesticated cats and dogs, these furry friends have taken on increasingly important roles in people's lives. As wild animals, dogs and cats first entered human life in the role of hunting animals and guardians, then as companions and finally as family members. Author and science journalist David Grimm explores theses notions in his new book "Citizen Canine: Our Evolving Relationship with Cats and Dogs" (PublicAffairs, 2014). "Our last common ancestor with [dogs and cats] was probably more than 100 million years ago.
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