Whether they're showing a little extra love or trying to tell you something's up, a dog's tongue can say a lot Understanding these behaviors helps us build a stronger, more Why is my dog's tongue hanging out? Tuff Pets 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 Why Does My Dog Sleep With Their Tongue Out? 10 Vet Reviewed Reasons Dogster Day 22: Tongue Flick = Uncomfortable? Why Do Dogs Stick Their Tongue Out? Potty Buddy