They take their dogs and their dreams and out they go, inadvertent loners whose paths crisscross on the single Manhattan block where they live. Cathleen Schine’s The New Yorkers (Farrar, Straus and Giroux) is a novel of urban entanglements (will spinsterish Jody and her elderly pit bull mix, Beatrice, snag handsome-when-he-smiles Everett, or lose him to young Polly and her puppy? Will bitchy Doris succeed in putting dog lovers on a tight leash?). Treats: Schine’s luscious cityscapes and Leanne Shapton’s fetching illustrations.