12 Vet Verified Facts About a Dog's Tongue Dogster 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 Sticking Out His Tongue? TrustedHousesitters.com Understanding Your Dog's Quivering Tongue 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 Why Do Dogs Lay Their Tongues on You Mid Lick? DogVills