His hand thickly bandaged, 91-year-old Ken Heffren described Tuesday how he fought off a vicious dog attack in his backyard. Heffren, a feisty World War II veteran and retired telephone company employee, said he was fighting for his life as he tried to fend off the 80-pound pitbull-Rottweiler cross on Sunday afternoon with a hammer and a gardening trowel. With no-one home, Heffren said his calls for help from neighbors went unanswered for several minutes as the dog came at him. The pitbull cross dug below the fence between Heffren and his neighbor to enter his yard, Auburn Police reported....