The Dog Walker by Leslie Schnur Pocket Books $95 Nina Shepard, a Manhattan dog walker, may not have a boyfriend or a real purpose in life, but she does have a job that offers her one great opportunity: she can snoop around strangers' homes when she comes to pick up their dogs. That's how she ends up falling in love with a man she has never met. Daniel McGuire seems perfect in every way. He listens to Mozart and Lenny Kravitz. He's 32, he skis, watches baseball on TV, plays poker every Wednesday night, runs in Central Park five days a week and his next vacation will be spent river-rafting down the Bio Bio in South America. But Daniel is an impostor and by the time Nina learns who he really is it's too late. Meanwhile, Nina must deal with numerous eccentric dogs: Wallis and Edward, the spoiled dachshunds; Che, the stone-deaf beagle; Safire, the bulldog who stares at walls; and her own beloved mutt, Sam.