Bechtold makes a sturdy debut with these three episodes in the life of a big dog with scrawny self-esteem. Although he is intimidated by strangers and totally unable to catch thrown objects, Buster discovers that he’s a good listener, a talent that comes in handy when there’s an escaped hamster to track down, a gang of nocturnal garbage-pail plunderers to catch in the act, or a lonely human to comfort. Slinking anxiously through airy, simply drawn scenes, the pop-eyed, charcoal-colored pooch looks ready to bolt at the drop of a hat, and while he finds a measure of courage at last in the company of his outgoing canine companion, Phoebe, readers will want to give him a reassuring hug. Scoot over, Mudge. (Fiction. 6-8)