CORAL SPRINGS · A burly exotic guard dog, one of several that frightened residents of an upscale neighborhood in recent days, ferociously mauled and killed its owner Friday afternoon, apparently in sight of the woman's young daughter. Police said they found the dog, a Presa Canario named Zino, in the backyard of a home in the 9000 block of the Northwest 39th Court in The Hills neighborhood. It was standing over the body of the mother of two.