First, as we’ve already seen, the faces of dogs are remarkably expressive, and many of their expressions are similar to ours. More than any other animal except our own children (and possibly chimpanzees), dogs wear their hearts on their sleeves. The faces of dogs are like living, breathing, fur-covered emotions, with none of the masking and censoring made possible by the rational cortex of mature adult humans. The expressiveness of dogs gives them a direct line to the primitive and powerful emotional centers of our brains, and connects us in ways that nothing else ever could. When we look at dogs, we’re looking into a mirror. That they express happiness so well, and that happiness is contagious, is just icing on the cake.
Second, the sociability of dogs is similar in many ways to that of humans. Dogs evolved from one of the world’s most social species and naturally seek companionship. That’s why sheep-guarding dogs stay with the ﬂock, that’s why some dogs form friendships with horses that last a lifetime, and that’s why your dog is waiting at the window when you drive home from work. Dogs will live alone if they have to, but as long as there are enough resources to go around, dogs will always choose the company of others. This is as true of adult dogs as of puppies. In many other species, the young can form strong attachments to others, but once they’ve matured, their interest in forming new bonds decreases. Not so dogs—you can become best friends with an older dog in just days or weeks, so strong is their desire for companionship.
Although dogs cling to any kind of social relationship, they don’t treat humans as any port in a storm. They seem to be as attracted to us as we are to them. Even dogs who’ve been socialized for only minutes as puppies are able to form strong attachments to people. (Usually, however, only to a small group of highly familiar people; they remain uncomfortable around strangers all their lives.) By contrast, wolves must be taken away from their mothers at three weeks and raised by humans to be comfortable around us as adults. And dogs want more than just to hang out with us; they seem to want to understand us, and to want us to understand them. They watch our faces all the time for information, just as humans do when they’re unsure of what another person is trying to communicate. You can see people do the very same thing, in a game that dog trainers play to sharpen their skills. One person uses a clicker to train another to perform some action, in a kind of “warmer/colder” game. No words or visual cues are allowed; there’s just the sound of the click to tell the trainee that she’s on the right track. Yet even though trainees are told they’ll get no other information, they turn to look at the face of the trainer when they become confused. Dogs do exactly that when they’re confused about what we want: herding dogs will break their focused stare to turn and look at their handler’s face with the visual equivalent of “What?!” Dogs might even be better at decoding certain types of human signals than our closest relatives, chimpanzees. In some studies, chimpanzees, even ones familiar with people, weren’t able to locate hidden food if the experimenter pointed to it. Subsequent studies on dogs suggested that they were more adept than our closest relatives at the task.