A brave pet owner desperately wrestled with a large dog after it viciously mauled her beloved chihuahua named Chieko to death. Genevieve was walking her two chihuahuas outside a row of shops in Cromer in Sydney's northern beaches when a breed of bull terrier bolted out from an alleyway on Tuesday. The terrier launched onto Chieko and clamped its jaws around his neck before violently shaking him as his owner watched on in horror. A brave pet owner desperately wrestled with a large dog after it viciously mauled her beloved chihuahua named Chieko outside a row of stores on Cromer Street in Sydney