I am so glad you got your baby back! What a scary thing to go through.
I had a similar incident this morning. Henri was in the backyard playing with my parents pug, they had been out there for a while so we go to call them in but they didn't come, the backyard isn't very big and its fenced, so we knew something was wrong. My brother slipped his shoes on and went out there to look, he came back saying that the gate on the side of the house was open! We all ran out front to search for the dogs and thankfuly found them on the side of the fence trying to get back in. When this all happened I thought of this thread and I was so afraid that my baby was gone.
I am so happy that your yorkie and mine are safe