Aries, an Anatolian shepherd, warily watches a stranger approach a pen where he and other members of his family — including eight fuzzy, 2-month-old puppies — roam alongside a grunting pig and several bleating goats. Livestock guard dogs such as Aries are in demand in Montana these days, an important tool as the state deals with an increasing number of grizzly bears. Sign up for The Morning newsletter from the New York Times Anatolians — large, muscular dogs that originated in Turkey and were br