While humans use their eyes and hands to find out about the world around them, dogs use their noses and mouths. Sniffing other dogs` backsides, and also faeces, the ground and other objects is an important part of canine interaction and communication.
BY sniffing the ground, dogs can identify territorial boundaries and mating possibilities. Investigating another dog's rear end identifies its sex and whether it is a potential friend, mate or foe.
Types of Tail-Wagging
Motion
Emotion
Wagging a raised, stiff tail
Implies tention and potential aggression
wagging a low tail, possibly between his legs
Indicates fear and/or submission
Energetically wagging a tail at half-mast
Usually a good sign
Wagging with a relaxed body, 'smiley' face
Looking to play or receive attention
Why do some dogs chase their tails?
Tail-chasing is classed as a stereotype. It gives a needy dog something to do, providing a kind of comfort.