Chap can't help sniffing around the camera, while Ace and Yayoi are eager to play.

Observing Labrador retrievers at the Japan Guide Dog Association's Training Center in Yokohama, one learns a fundamental fact about guide dogs -- even though they're well trained, they are just as inquisitive and fun-loving as ordinary pet dogs.

They can also get into mischief, says the center's general manager, Park Sun Ja, who has seen her canine students stick their noses into garbage bins in search of lickable candy wrappers.