Understanding Dog Chattering Behavior and Its Purpose Why Do My Dogs Teeth Chatter? Kinship Dogs will flick their tongue as an appeasement signal but also as a signal theyre relaxing. While similar each signal has subtle differences. I will do posts on both. , The tongue flick is a signal Why Your Dog's Tongue Might Be Their Most Important Body Part Kinship 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