Hanging Tongue Syndrome Ever seen a dog flick their tongue and vibrate their jaw after sniffing something interesting? This is called the Flehmen response. It's a special technique dogs use to enhance their sense of Why Does My Dog Stick His Tongue Out? The Dodo Why is my dog's tongue hanging out? Tuff Pets Why Does My Dog Stick His Tongue Out? Causes Explained Understanding Your Dog's Quivering Mouth: The Joy of Eating Steak