Police marksmen called to save a two-year-old child from the jaws of a bull mastiff had to pump 17 bullets into the dog before it would die. The animal had already been stabbed four times with a bread knife by its owner in a desperate effort to make it drop his son. When police marksmen arrived, they initially fired a 50,000-volt Taser gun in a vain attempt to stop the frenzied attack by three-year-old family pet Mitch. They then emptied the entire clip of a Glock 17, 9mm pistol into the dog before it finally collapsed and died. "They fired...