Many Rescue Sites mention the problem that "typical" rescue Greys
"don't Know How to PLAY" and are fearful of almost any human.
I wouldn't call it a problem but greyhounds do not usually know how to play (with stuffies for instance), but they sure do manage to develop this talent with little or no help from us. Just supply the stuffy.

Sometimes your existing greyhound will teach the new one and that's always cute to watch.

It also takes the a little time before they will take a treat from your hand. Not like they are afraid, but more because they don't know what to do.

Jay