Hanging Tongue Syndrome Day 22: Tongue Flick = Uncomfortable? What Is Hanging Tongue Syndrome In Dogs? Signs & Causes 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 Do Dogs Sleep With Their Tongue Out? 6 Vet Approved Reasons & FAQ Hepper Pet Resources Why does my dog's tongue always stick out? When it's cute and when to worry AS USA