Why Do Dogs Lay Their Tongues on You Mid Lick? DogVills 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 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 Day 22: Tongue Flick = Uncomfortable? Why Does My Dog Stick His Tongue Out? Causes Explained