THE VOICE
Dogs use to bark to advert others of danger. A howl in the middle of the night is a concentration call. When a dog is in heat a male dog can howl for hours and hours in desperation. The female responds with the same howl. Two dogs that may encounter an bark are just imposing themselves. This makes them have more confidence. The nature of dog sounds can be described as follows: a hoarse and cut bark expresses a menace (a dare to another animal or an advice to an intruder so that it moves out of the territory), a happy bark ( coming to its owner or before going for a walk), a special bark to indicate a prey, etc. Then there are the obvious sounds: cry, lament, howl, screams, and grunts.
THE EYES
The look of a dog can tell a lot. A fixed look means fear or malevolence. The look of a dog to sheep or cows can control them and place them in order.
ATTITUDES AND MIMIC
Gestures of a dog to show happiness are the constant movement of the tail. A tail between the legs means fear. A dog in an aggressive posture shapes and moves its body to make it look bigger: it elongates, it's hair gets straight up, etc. To exhibit submission a dog often lies itself on the floor and with its tail between its legs it shows its genitals. When a dog tries to play with another it lies in a sphinx position, or it 'dances' around the other dog, or it gently bites the other's tail, etc.
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