Relaxed ears mean that a dog is calm. Erect ears show that a dog is alert and attentive. Ears that are up and forward mean a dog is challenging or being assertive or aggressive. Ears that are laid back indicate that a dog is worried or scared.
Play bowing is an invitation to play and a sign of happiness.
Licking the lips is a sign that a dog is worried or is trying to appease a person or another dog. A relaxed mouth means a dog is calm. Lips pulled back is a challenging or warning sign, especially when combined with a snarl.
Pawing is an appeasing gesture. Licking another dog's face is an invitation to play or sign of deference.
Paw lifting is a dog's way to call your attention. It may be an invitation to play or a means to tell you something else.