Dog Body Language #6 Sometimes dogs flick their tongues or lick their lips at times that are not associated with eating or drinking. It often indicates that they are uncomfortable. Next time Ever seen a dog flick their tongue and vibrate their jaw after sniffing something interesting? This is called the Flehmen response. Its a special technique dogs use to enhance their sense of smell, My DOG Keeps Sticking Their TONGUE Out (9 Causes and Solutions) Why Do Dogs Stick Their Tongue Out? Top Dog Tips