Fast loose wags generally show a happy, friendly dog feeling playful and good.
Slow slight wags with tail lower down may indicate insecurity or anxiety.
Quick choppy wags high up can signal arousal, agitation or potential aggression.
Tail up and curled over back is a confident, often dominant posture.
Relaxed, loose wags in a lower neutral position typically reflect calmness.
No wagging with tail sticking straight out signals a dog who is highly focused.
A tucked tail indicates fear, uncertainty, or submission to other dogs.