Read the whole dog, not one part
No single signal means anything reliable on its own. A wagging tail with a loose body and soft eyes is a completely different message from a wagging tail with a stiff spine, pinned ears and a hard stare — and it is the second combination that surprises people.
The habit worth building is scanning four things quickly: the tail, the ears, the eyes and mouth, and the overall body tension. It takes a couple of seconds once it becomes automatic, and it is the difference between noticing discomfort early and noticing it at the growl.
The tail tells you more than 'happy or not'
Height, speed and stiffness all carry separate information. A low, loose, wide wag that takes the hips with it generally signals genuine relaxation. A high, stiff, fast wag — sometimes described as a flag — accompanies arousal, which can be excitement but can equally be tension building toward a reaction.
A tucked tail almost always signals fear or appeasement and is worth taking seriously rather than talking a dog out of. Breed matters here too: a curled-tail breed's neutral is different from a Labrador's, so calibrate to the individual dog rather than to a generic diagram.
Ears, eyes and mouth
Ears pinned flat back usually indicate fear or appeasement. Ears held forward and rigid accompany alertness that may be confident interest or may be a prelude to something else, depending on everything below them. Softly forward and mobile generally means engaged without tension.
In the eyes, the signal worth learning by name is 'whale eye' — the whites showing in a crescent because the head is turned away but the eyes stay locked on something. It is one of the most reliable early indicators of discomfort, and it very often appears in photographs of children hugging dogs.
A relaxed dog's mouth is usually slightly open and loose. A closed, tight mouth with tension at the commissure — the corner where the lips meet — is a meaningful change. So is a sudden hard stare accompanied by stillness.
- Whale eye — whites showing as a crescent, head turned, eyes fixed
- Hard stare — direct, unblinking, usually with a still body
- Tight mouth — closed, with tension at the lip corners
- Pinned ears — flat against the skull rather than softly back
- Furrowed brow — visible tension above the eyes
The escalation ladder
Dogs escalate in a predictable order, and each rung is a request for more space. The signals near the bottom are so subtle that most people never register them, which is why a bite so often seems to come 'out of nowhere' — the dog asked five times first.
| Stage | What it looks like | What to do |
|---|---|---|
| Very early | Lip-lick, yawn, blinking, turning the head away | Give space immediately; end the interaction |
| Early | Turning the whole body away, walking off, scratching, sniffing the ground | Stop what you're doing — this is a clear no |
| Middle | Freezing, whale eye, hard stare, stiff body | Stop moving, back off calmly, do not reach in |
| Late | Growling, showing teeth, snarling | Retreat and remove the trigger. Never punish this |
| Final | Snap, then bite | The warnings were all used up |
Displacement behaviours: stress in disguise
Some of the clearest stress signals look like ordinary dog behaviour happening at an odd moment. A yawn when the dog isn't tired, lip-licking with no food present, sudden intense scratching or ground-sniffing in the middle of a training session, or a full-body shake-off when the dog isn't wet — all of these are displacement behaviours, and they mean the dog is under pressure.
The shake-off is worth knowing specifically because it usually marks the end of a stressful moment. A dog who shakes off leaving the vet's is resetting. Let them do it rather than interrupting.
- Yawning when not tired
- Lip-licking with no food around
- Sudden scratching or sniffing mid-interaction
- A shake-off when dry — usually a reset after stress
- Turning the head or body away — a polite request for space
What to teach children
Most bites to children happen at home, with a familiar dog, during an interaction the child initiated. The two rules that prevent the most incidents are simple enough for a four-year-old: let the dog come to you, and never approach a dog who is eating, sleeping, or has taken something to a corner.
Hugging is the one worth being firm about even though it feels unkind to prohibit. Most dogs tolerate rather than enjoy being hugged, and the photographs that prove it are full of whale eye and turned heads. The AVMA's bite-prevention material is a good thing to go through with children directly.