Our 2.5 year old GSD is incorrigible when it comes to having kids-or small adults- visit. When my daughter's friends come over he obsesses on them, follows them around and will attempt to hump them . So embarrassing! If we try to keep him separate from them he will whine and pant and pace. We scold him and after awhile he will calm down and just be happy being around the kids and playing...but we never leave them alone with him. How can we stop this behavior?! Is it about hormones? Dominance? Playfulness? Help!