A mom of one from England is crediting her heroic dog for saving her life when two strangers attacked her by holding a knife up to her throat. Amy Edmondson, 30, said her pitbull-mix, Star, who normally doesn’t even hurt a fly, leaped to her defense during the terrifying ordeal. The Essex resident was returning home from a dog walk at 11:30 p.m. on April 5, when a man and woman approached her for directions. “They were asking me where Southchurch was,” Amy said. “I turned around and pointed in the right direction, and the man just jumped on my back, pushing me to the ground and held a knife to my throat.” “They kept saying give me your money, where’s your money, we need your money.” Amy remembers lying on the floor for what she describes as “forever.” During the attack, she admitted fearing the worst. “All I was …