When you walk your dogs, they sniff other dogs' urine that tells them everything about that dog. They then urinate over that area, marking their territory and leaving their information.

Dogs' eyes are very informative. But analyzing their eyes alone can be misleading. So you should observe the entire body language to understand their feelings.

Normally, a dog looks directly into people or other dogs' eyes when he feels confident and superior, and he averts his gaze when feeling submissive.

Also, the size and shape of the eyes change slightly with his mood, though it's difficult to detect. The eyes will appear larger than normal if he’s threatened, and become smaller when he is frightened or stressed.

The position of a dog's ears change according to its mood. When your dog is alert and feeling aggressive, he will raise his ears. If he pulls his ears back, he is showing his affection. Your dog is signaling fright and submission when he puts his ears down.

Dogs wag their tails frequently, and for various reasons. When they are happy, playful and excited, they wag their tails gently from side to side. They hold their tails up higher than normal when they are confident or alert, and lower their tails when nervous and submissive.