Glossary

Tail wagging

A dog's tail movement, which signals arousal and emotion but does not mean a dog is friendly.

Also called: tail wag, wagging tail, tail position, tail language

A tail wag shows that a dog is aroused, but not what kind of feeling it has. A broad, loose wag with a swaying rear end often means friendly excitement. A stiff, high, fast wag can mean alertness or a challenge. A low, slow or tucked wag often signals worry or uncertainty.

Research suggests that dogs wag more to the right when feeling positive, and more to the left when feeling negative or uncertain, and that other dogs react differently to the two. The difference is small, so do not rely on it alone.

Position matters too: a neutral tail position differs by breed, so a curled tail on a husky is not the same as a high tail on a hound. Never approach a dog just because the tail is moving. Read the face and body as well.

Last reviewed November 8, 2026

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Related terms

Dog body language The postures, faces and movements dogs use to communicate feelings and intentions without sound. Stress signals Small changes in behavior, such as panting without heat, yawning, shaking off or a tucked tail, that show a dog is uneasy. Play bow A posture in which a dog lowers its front legs and chest while keeping its rear up, signalling an invitation to play. Piloerection The raising of the hair along a dog's neck, shoulders and back, a sign of strong arousal rather than automatic aggression.