I use training treats...food. I start by beeping it and giving them a treat as we walk around. I do that a little bit until I see the dog showing me attention when the collar beeps. I then put them on a stay command and beep the collar and give the come command at the same time, rewarding the dog when it gets to me. Do that for awhile and then put them on a stay command and beep the collar without the come command. From there I just start letting them play and periodically beep it....rewarding the dog when it gets to me. Otis was easy to train this way....we'll see how fast Shelby catches on. It's making it easier with Otis already knowing how to do it. I put them on a side by side stay command together and then beep the collar with no come command. Otis reacts and Shelby in turn reacts. Only been doing it a few days now. Just a couple short introduction sessions. I've not introduced any negative correction yet to Shelby. She's about 5 1/2 months old.