You may assume that the ‘Greeting Stretch’ is like a human ‘Morning Stretch’. That your dog has probably been sleeping or relaxing before you arrived home, and that this is his way of waking up his muscles, joints and tendons. A way to get the blood flowing again.
However, the ‘Wake Up Stretch’ is actually very different from the ‘Greeting Stretch’ that many pet owners sometimes see when they come home.
In doing a bit of research into this, we came across Brenda Aloff’s wonderful description in the book Canine Body Language: A Photographic Guide:
“The Greeting Stretch is a posture used only towards someone the dog likes and with who 
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