Ears
Relaxed, natural for the breed
Pricked and pointing forward
Pinned flat back
Tail
Loose, natural height, easy wag
Held high and stiff, small quick wag
Tucked under the belly
Eyes and mouth
Soft eyes, loose mouth
Lip-licking or yawning (not tired)
Whites showing, tight mouth or panting with a curled tongue
Body
Loose and wiggly
Frozen still, weight forward
Crouched, trembling or backing away
Based on signals described by animal-welfare charities and vets. Context always matters: a dog that is scared of the vet reads differently from one at a playground.