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I am looking for an article I have on this….it is around here somewhere….but in very broad explanation the wag means there is engagement of the emotion that creates the position…. it says something about a right side leaning wag and left side leaning wag….and that the helicopter tail is joy usually due to a greeting…..Sorry I can’t recall more….Ill find it and share! Mike has some links here too… I like this study ALOT! https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9356099/
ncbi.nlm.nih.gov
Left-right asymmetry and attractor-like dynamics of dog’s tail wagging during dog-human interactions
Tail wagging plays an important role in social interactions, e.g., dogs show asymmetrical tail wagging in response to different social stimuli. However, the effects of social cues on tail wagging and the intrinsic organization of wagging behavior remain ...
