Why Do Dogs Wag Their Tails?

Captions provided by CCTubes – Captioning the Internet! A puppy’s tail wagging on the left side of their body might mean something profoundly different than wagging on the right side.

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Sources:
http://www.akc.org/content/entertainment/articles/why-do-dogs-wag-their-tails/
https://www.psychologytoday.com/blog/canine-corner/201112/what-wagging-dog-tail-really-means-new-scientific-data
http://www.cell.com/current-biology/abstract/S0960-9822(07)00949-9
http://www.cell.com/current-biology/fulltext/S0960-9822(13)01143-3
http://articles.latimes.com/2013/oct/31/science/la-sci-sn-what-is-your-dog-really-saying-when-it-wags-its-tail-20131029