Decoding Canine Language: Posture, Mouth and Tail (Part 2)
Updated 15 October 2026
In short: your dog's posture, mouth and tail say a lot about how it feels, as long as you read them together. A loose body, a relaxed mouth and a tail sweeping widely mean a calm dog. A stiff body, a tight jaw or a high, rigid tail mean tension. A wagging tail doesn't always mean happiness: look at its height, how wide the wags are and the rest of the body.
After eyes and greetings (part 1), this second part looks at the rest of the body.
How do you read your dog's posture?
Overall posture is often the first clue. From calmest to most tense:
Relaxed
Soft face and body, weight evenly spread, calm movements: it feels safe.
Alert
Ears forward, head and body leaning in, tail up: something has caught its attention.
Stalking
Slow, careful gait, head low, fixed gaze: it's highly focused, in play or on prey.
Uncertain
Front of the body stretched forward, weight on the back legs: it can't decide whether to approach or back off.
Anxious
Hunched, tail tucked, ears flat, sometimes trembling: it wants to avoid contact.
Defensive
Low body, ears pinned back, growling or teeth showing: it feels trapped and may defend itself.
Threatening
Hard stare, tight jaw, stiff body leaning forward, tail high and rigid: a clear warning.
Attack
When earlier signals were ignored or the dog can't escape: it lunges and growls, hackles up.
Respect fear. If your dog looks anxious, never force it to face what scares it: this can worsen the fear and damage its trust. Move it away from the trigger and give it time. Calming signals are often the first signs to look for.
Raised hackles? Hair standing up along the back signals strong arousal (fear, surprise, intense play), not necessarily aggression. Read the rest of the body.
What does my dog's mouth say?
The mouth is tricky to read: a sign of stress can look like a smile.
| Mouth | What it looks like | What it often means |
|---|---|---|
| Relaxed | Loose jaw, mouth slightly open or closed without tension, soft tongue | Calm, contentment |
| Lips drawn back | Corners pulled back, panting without exercise, ears back | Stress, discomfort (often mistaken for a smile) |
| Closed, tight | Clenched jaw, lips pushed forward, hard stare | Worry, restraint or irritation |
| Teeth bared | Lips curled, teeth showing, body tense | Warning: it wants you to back off |
| Submissive grin | Lips lifted over the front teeth, low, loose and sometimes wiggly body | An appeasing gesture in some dogs, not to be confused with a threat |
What do tail movements mean?
A wagging tail mainly means the dog is emotionally aroused, not necessarily happy. Read its height and the type of wag, allowing for breed (a greyhound, a husky or a docked tail don't read the same way).
- Neutral (its usual position for the breed), loose hindquarters: relaxed.
- Low or tucked between the legs: lack of confidence, anxiety, fear.
- High: alertness, excitement. High and stiff with a tense body: agitation or tension.
- Wide and loose, wiggling hindquarters: happiness, friendliness.
- Circular ("helicopter"), wiggly body: very happy, often at reunions.
- Small and fast, tail low: anxiety or uncertainty.
- Small and fast, tail high and stiff: high arousal or tension, be careful.
According to Quaranta et al. (2007), dogs wag slightly more to the right when they see their owner, and more to the left when facing an unfamiliar, imposing dog. A subtle difference that's hard to see with the naked eye. Find out more: tail-wagging asymmetry.
A dog wagging its tail is always happy.
FALSEIt's mainly aroused. A high, stiff tail wagging fast with a tense body can come before a growl.
A tucked tail often signals fear.
TRUEYes, especially with flattened ears and a low body. Give it space.
A dog showing its teeth is always aggressive.
FALSESome dogs do a submissive grin, with a low, loose body. The whole body makes the difference.
On walks: letting your dog express itself
A constantly tight lead freezes your dog's posture and takes away part of its language (moving off, curving, sniffing). A loose lead and a Y-harness that leaves the shoulders free help it communicate, and help you read it.
Frequently asked questions
How can I tell if my dog is scared?
Low or hunched body, tucked tail, flattened ears, lips drawn back, panting, trembling, averted eyes. Move it away from what scares it without forcing it.
My dog is wagging its tail: is it happy?
Not always. Wide wags with a loose body mean happiness; a high, stiff tail with short wags points more to tension.
Why does my dog "smile" showing its teeth?
Some dogs lift their lips as an appeasing gesture, with a low, wiggly body. If the body is stiff and the stare hard, it's a warning instead.
What should I do if my dog looks threatening?
Don't punish it: a growl is a useful warning. Put distance between it and what's bothering it, then get professional advice if it keeps happening.