every dog is different.

A dog learns early on who his most important caretaker is, and forms a special attachment to that person or persons.

And when we try looking from a new point of view—from the point of view of dogs themselves—new ideas may arise in our minds.

They are nearly as good as we are at noticing changes in pitch.

In one study, the dogs made 1,272 attempts to detect which patients had cancer—and missed only fourteen times. In another experiment, they sniffed out the cancer every time.

So a dog living with humans is not living in a pack. But he is living in a family. Like other families, people and dogs share habits, preferences, home. We sleep together and rise together. We walk the same routes and even stop to greet the same dogs. Our dog-and-human family works because we share basic rules of behavior.

Researchers have begun training dogs to recognize a particular smell—one produced by cancer tissue.

Most dogs will turn away from a stare if it goes on too long. But, unlike wolves, they seem to want to inspect our faces.

Wolves are definitely better at solving certain physical problems—ones that involve objects (like ropes).