Any suggestions on how to get Summer to come to me when I call her. Tried the treats and it works some of the time. But when she's in the back yard she just let's lose and won't come at all have to chase after her when its time to go in . She thinks its a big game. I know it's time for training school just haven't got there yet. I don't want her to be one of the dogs that takes off the first chance they get..