All dogs know the same language. You and your dog probably pick up on each other's signals without thinking much about it. But if your dog begins to behave differently, if you are getting to know a new dog, or if you encounter a dog you don't know, it helps to be able to read the universal body language of dogs.
Signals Dogs Use
Although a dog can't speak and has no hands and fingers for gesturing as humans do, you can watch key parts of his body to determine how he's feeling and reacting to the world around him.
Face. Although the dog's facial muscles are not as refined as humans, he can wrinkle or straighten his forehead to show confusion or determination. If your dog wants you to give him further direction, he may raise his eyelids quizzically and tilt his head to one side.
Eyes. A dog's eyes brighten when he looks at a creature he considers friendly and when he wants to play. If he is afraid, his pupils dilate and he shows the whites of his eyes. He averts his eyes to avoid confrontation. But if he is angry or ready to defend himself, his eyes narrow and follow your every move. At this point, it's particularly important not to look the dog in the eye because he sees that as a challenge to defend his position.
Lips, teeth and tongue. A relaxed dog in normal posture may let his tongue loll out of his mouth. If he wants something from you, if he is happy or wants to play, he may pull his lips back in what appears to be a smile and show his teeth, an expression, by the way, dogs show only to humans and not to other dogs. But beware the dog that bares his clenched teeth and wrinkles his nose. He is ready to attack.
Ears. The dog's sense of hearing is much more acute than ours and even dogs with floppy ears have the ability to move and turn them to follow sounds. If a dog's ears are raised, he is relaxed, listening, or showing acceptance. If they are back, he may be signaling submission and deference or may be frankly fearful.
Tail. A dog wags his tail when he is happy or wants to play. It is really an energy indicator. When he is submissive, he tucks it between his legs. A taut tail, held down rigidly behind him, may show that he is prepared to spring since he uses his tail for balance when jumping.
Voice. Dogs are vocal animals. They yip, bark, whimper, howl, and growl. The pitch or volume of their sounds can increase with their level of emotion. A bark may be playful or aggressive. Unlike body signals, dog noises can mean different things from different dogs.
Posture Speaks Volumes
When two dogs meet, as long as their human companions aren't tugging tight on their leashes, they carry out a series of actions that looks like a choreographed dance. With their bodies tense and tails taut, they circle and sniff each other, silently gathering and exchanging information, ready to defend themselves at any moment if necessary. They hold their ears back and the hair on their back may stand on end. They often avoid direct eye contact at first, sizing each other up to determine if the stranger is strong or weak, male or female, hostile or non-hostile. One dog may place his head on the nape of the other's neck or nip at his nose. It seems they are getting ready to fight and then, one lies down. Soon, they may separate and urinate. At this point they have agreed on which dog is dominant.
Dogs learn body language from their mothers during the first 8 weeks of their lives and they test out this form of communication with their litter mates. If a dog misses out on such training, he will have trouble communicating with other dogs throughout life.
Normal posture. The dog appears alert with head held high. His tail moves freely. His jaw is relaxed.
Invitation to play. The dog happily signals his desire to play by wagging his tail and dipping down into a "play bow." His front legs are in a crouch and his backbone swoops up, leaving his rear haunches high. His head is held up expectantly to capture your attention. He may raise a front leg or lean to one side with his head.
Submission. The dog crouches down further and still appears relaxed. He may lift a front foot as in a play invitation, but his ears are back and his tail is down. He may yawn, scratch, or sneeze, which is meant to calm him and the dogs or people confronting him.
Fearful aggression. A dog who is afraid tenses his body and holds his tail rigid, though it may be wagging. His rear legs are ready to run or spring. He bares his teeth, draws back his ears and the hair on his back stands on end. He growls or snarls constantly to warn off the subject of his fear.
Dominance aggression. Teeth bared, this dog stares you down and advances confidently with his tail wagging slowly and his ears in the forward (alert) position.
Total submission. The dog drops his tail and curls it between his legs. He drops his head to avoid eye contact. He rolls over on his side and bares his belly, with one hind leg raised and urinates. If he isn't afraid, he'll tilt his head up a bit and raise his ears to show trust.