For a long time, domesticated dogs were seen as just the slobbering, dumbed-down ancestor of the wild wolf. Dogs, though, have learned a few tricks of their own through the millennia -- and can teach us a lot about ourselves.Guinness the border collie loves the program. Flip on the monitor, and she can sit for hours watching the colorful images flitting across the screen -- like a teenager in front of a Playstation. As soon as the images change she presses the touch screen with her nose. If she selects the correct one of two photos, a piece of dry dog food automatically drops down to her feet. If she selects the wrong one, the screen turns red for a moment, and then the exercise continues.
Guinness, though, rarely makes mistakes. She can identify different landscapes, and picking out dog breeds, likewise, doesn't present much of a challenge. She's even adept at choosing human faces. "It's only when she is supposed to recognize the same face in different photos that she makes a lot of mistakes," explains Friederike Range, a biologist at the University of Vienna.
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