Why Does My Dog's Tongue Stick Out? I Love My Chi Did you know your dog's tongue can reveal how hot they are? @passionatelypets shares four tongue shapes to watch for during warmer weather: Cool & Comfortable: When a dog is relaxed Facts About Dogs Tongue You Did Not Know MyFurries Blog Why do dogs sleep with their tongues out? Snoozer Pets Ever seen a dog flick their tongue and vibrate their jaw after sniffing something interesting? This is called the Flehmen response. Its a special technique dogs use to enhance their sense of smell, Why Do Dogs Pant?