I have two rescue Labs that I absolutely adore. I installed "Invisible Fence" in order to keep them home and it's a dream come true. My oldest rescue, Hokie, roamed for companionship and I got the younger lab (3 months) but when I found out that they would eventually roam I made a phone call. We have 3 acres out of our nine enclosed and it works great. It took two days for them to figure out that they didn't want to cross the line. I love it and recommend it for anyone that wants a really great pet containment system.
labmomma