A dog owned by Grass Valley resident Rebecca Hahn has claimed the title of Best of Breed for the Entlebucher Mountain Dog class at the 137th Westminster dog show this year. Hahn also took the same title last year with her pooch, Jumanji. This year, Queso Von Adhem took the honor. At the Westminster Kennel Club, 2,500-plus canines of 173 different breeds and varieties are whittled down to six dogs in the prestigious final round in which one is crowned “Best in Show.” Hahn and her husband, Jay, are both retired Grass Valley veterinarians. “They’re just wonderful people and easy …