Have you ever seen your dog raise his paw when greeting a new dog?

Layla arriving at puppy socialization class.

How about the wagging tail and relaxed ears?  If you look closely you may also see a tongue flick as seen in this photo.  Layla a young boxer pup is greeting Cora with a look away, tongue flick, paw raise and while you do not see her cropped tail, her entire butt is wiggling!

A friendly dog will be moving about with lots of wiggles and bends in his body.  Soft averted eyes are harder to see, but are there when a friendly dog wants to assure another they mean no harm.  Note the brown and white pitt mix below greeting several new dogs with lots of good social skills.  She has made her intentions perfectly clear that she is friendly.