On a picturesque little corner in Bishop Arts, with a generous awning over the sidewalk and small round tables inside and out, Nodding Dog is a sophisticated hang-out for Cliffies and their dogs--a place whose every battered folding chair and aging sofa calls out for you to take a load off, sip some java and relax. The name is apt: Watch this place long enough, and you will pick up the pattern. First the dogs begin to nod off. Not too much later, their masters start to droop and snuffle in the midafternoon quiet. Where else can you do that? Fall asleep at a table on Lower Greenville and Avi Adelman will put a picture of you on his Web site! Not so Nodding Dog--the epitome of life on the cooler side of the river.