Glossary

Lip licking

A quick tongue flick over the lips or nose that, outside mealtimes, often signals a dog is nervous or uncertain.

Also called: lip lick, tongue flick, nose licking, licking lips

Lip licking, or a tongue flick, is a rapid swipe of the tongue over the nose or lips. A dog will lick its lips after eating or when it expects food. Outside these moments, especially during a vet visit, a stranger's approach or a hug, it is often a sign of stress or unease.

It is a small signal that is easy to miss, and it is best read together with others, such as yawning, turning away, a tucked tail or whale eye. A single tongue flick means little on its own.

It is not always about fear. Nausea, mouth pain or dry mouth can also lead to licking, so if a dog licks its lips often at home with no obvious trigger, mention it to a veterinarian.

Last reviewed November 8, 2026

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Related terms

Stress signals Small changes in behavior, such as panting without heat, yawning, shaking off or a tucked tail, that show a dog is uneasy. Calming signals Subtle behaviors such as yawning, turning away and sniffing that dogs are said to use to ease tension and avoid conflict. Whale eye A look in which a dog turns its head away but keeps its eyes on something, showing a crescent of white, and is often uneasy. Tail wagging A dog's tail movement, which signals arousal and emotion but does not mean a dog is friendly.