How do you handle a dog that will just lie down when she doesn't want to go with you. She is a 5 year old Shepherd mix and will go out willingly on a walk but doesn't want to come back home and will lie down and not move. She does the same thing if you want to put her out and she doesn't want to go out. We have tried treats but she is not interested in any food (bacon, hotdog, doggie treats). I have never had that issue in a dog before and don't know how to deal with it. Thanks for any suggestions!