your dog may break and wag it's tail when it sees you or when you rub its back such communication is called
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● A slight wag, with each swing of only small breadth, is usually seen during greetings as a tentative, "Hello there," or a hopeful "I'm here."
● A broad wag is friendly: "I am not challenging or threatening you." This can also mean: "I'm pleased." This is the closest to the popular concept of the happiness wag, especially if the tail seems to drag the hips with it.
● A slow wag with the tail at half-mast is less social than most other tail signals. Generally speaking, slow wags with the tail in neither a particularly dominant (high) nor a submissive (low) position are signs of insecurity.
● Tiny, high-speed movements that give the impression of the tail vibrating are signs the dog is about to do something, usually run or fight. If the tail is held high while vibrating, it is most likely an active threat.