I just recently moved, and at the new house the yard is no fenced in. I also have kids that run in and out of the house playing. Has anyone used a GPS dog collar? I have been looking into them because our dog has slipped past us as we walk in the house and he then asks like a wild dog. Chasing him only makes it worse. I have looked up Whistle, which is GPS and activity monitor. It seems to be the cheapest. I have also looking into one called WUF. It a little more, but there doesn't seem to be a cost for the gps each month.