The term 'Guard Dog's Warning' is a phrase that refers to the sound a guard dog makes when it is warning someone to stay away. This sound can be expressed in two ways: SNARL (5 letters) and grr (3 letters). A SNARL is a deep, guttural growl that is often accompanied by bared teeth and a menacing look. A grr is a shorter, sharper sound that is usually accompanied by a raised hackles and a stiffened stance. Both sounds are meant to intimidate and warn potential intruders to stay away.