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 is my dog vibrating? Why Do My Dogs Teeth Chatter? Kinship Why is Dog Sticking Tongue Out While Sleeping Internet Vibes Why Your Dog's Tongue Might Be Their Most Important Body Part Kinship Why is my dog's tongue hanging out? Tuff Pets