My wife was outside playing with Shadow today and was waiting for fer friend that she has not seen in over a year. When her friend got out of her car and my wife put the dog into a sit and Shadow sat there which was fine. Well this is where the problems started. My wife instead of putting a leash on the dog and walking her so they could meet instead left her on the line we use to play with her outside. Her friend is from Japan and never been around a GSD and not thinking ran full speed at my wife and flung her hands out to give her a hug. Shadow did NOT take kindly to this and ran right at her and hit her in the gut knocking her back about 5 feet or so. She stoped after that and walked back to my wife. The girl was not to badly hurt, she had a small tear in her shirt and a very small red mark but no hole in the skin. She is not mad at us and did not make a report. Normally I give treats to whoever is over and have them feed her to build trust up. My wife never got to this because of her friend running up to her to give her a hug. I was not at home at the time so this is what my wife told me. What at this point should I do.