If You Want to Know if Spot Loves You So, It’s in His Tail

JAAAAAAAAKKKKEEE – NYTimes.com

But there is another, newly discovered, feature of dog body language that may surprise attentive pet owners and experts in canine behavior. When dogs feel fundamentally positive about something or someone, their tails wag more to the right side of their rumps. When they have negative feelings, their tail wagging is biased to the left