I really don't think Zero will have a lot of problems in that area. He just doesn't seem to mind who's holding his leash. One issue that may come up is he won't listen to anyone other than me. If I tell him to sit he will do so without thinking twice. If someone else does he looks at them like they just fell out of the sky, then looks at me as if to say, "Do I need to listen to this fool?"The Supervised Separation is often the hardest part of the CGC for dogs to handle. As dog owners, we don't often get the chance (or want to take the chance) of leaving our dog in the hands of a stranger in a strange place.