What's the posture like? down with a wagging tail?
One of my dogs used to do that, he was the rare shepherd that actually liked making new friends. I used to call it making himself very small. He'd lay down when he saw another dog approaching, wag tail, smile, be all charming. It was very endearing, far better than Venus' way of greeting other dogs 'HEY HEY YOU WANNA BE MY FRIEND' yap yap yap, knock it off be nice, they're not going to be your friend if you act like that...
Venus of Crooked Creek 1/26/13
Otto von Hena-C 05/23/08
Morgan Donnermond 08/04/01 to 9/28/12 Long Live the Queen!
I have duct tape and I am not afraid to use it.