Do Dogs Wag Tails On Purpose. Almost everyone has experienced being licked by an excited and friendly dog with a wild tail crazily wagging and knocking precious objects and drinks off of tables. A tail held straight out means the dog is curious about something. Its kind of like a human frowning. Dog use their tails to communicate from the wide sweeping wag of a happy dog to the tail between the legs to show they are scared.
In this fashion the dog could use the tail as a balancing weight when making sharp turns or while traversing narrow ledges or climbing uphill. This isnt always the case though. Happiness Happy dogs generally wag their tail back and forth while holding it high in the air. The original purpose for a dogs tail was to use it for balance the same way that many wild animals still use their tails today. In canines a tail may also serve as a type of rudder to help stabilize dogs in the water. It turns out it might be a little bit of both.
A tail is one element of body language that dogs use to communicate alongside body posture and facial expressions.
Dogs can control their tails and their tail wags but it appears they often start wagging out of instinct not conscious thought. Its used as part of their varied communication with one another and with humans. Maybe one of the most common misconceptions about dogs and their tails is that a wagging tail means a happy dog. Its probable that individual dogs have their own unique tail-wagging language. She can wag lower or raise her tail at will and she can stop it mid-wag too. A tail held straight out means the dog is curious about something.