REVIEWED BY CAROLINE LEAVITT
What explains the bond between man and dog? Science writer Franklin hypothesizes that when wolves fed on our scraps thousands of years ago, they became cute and responsive to survive. As wolves evolved into dogs, humans began thinking for them, and their brain mass shrank; we, in turn, lost brain mass as dogs became "beasts of emotional burden" responding to our feelings. Thus canines are our "touchstone to an emotional past we have forever lost." An enthralling read for science buffs and Fido fans alike.