Why Does My Dog Sleep With Their Tongue Out? 10 Vet Reviewed Reasons Dogster 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 Are all tongue movements stress signals? #dogbehavior #caninecommunication #doglanguage #caninebodylanguage #dogbodylanguage Day 22: Tongue Flick = Uncomfortable?