We are planning a long weekend at a friend's home in PA for Memorial Day weekend. They have a lot of property (I'm talking ACRES) and I know they will let us bring Shelby with us and encourage us to let her off her leash. It's a very rural area, they are not on a main road, but there is no fence. She will be over 5 months when we go, and we are working with her on "come" and "stay" and she's doing really well, but I'm scared she's going to take off and not come back. How should I handle this? I've never had a dog before, and I don't know how to make myself comfortable with her being off her leash. Thanks in advance.