I start tone training them as soon as I start hauling them to the woods. Every time I call them to me, I'm toning them. If they don't come, give them a little shock. It doesn't take long for them to learn the tone means to come back. I can tone my older dogs off running a hog or even a bayed hog if needed. If they don't come off, shock them... they know they're getting shocked for not coming to the tone and not getting shocked off the hog. It takes some time, but it's well worth it. Saves a lot of long days or nights... and it keeps you on the right side of the law by not trespassing. And no... it does not affect their range or bottom.
I did this with my 6 mo old pups this weekend, worked pretty good. I will continue