We have had the Dog Line now for about a year and are really happy with it. We have trained our dog (a kelpie) not to go over the boundary without receiving a command from us and we are able to leave the property without concerns that he will leave. (We don't have any fences). He has crossed the boundary and been zapped and is very wary of the beeping alarm. When we are home he doesn't need to wear the collar at all and at night he is locked up in a kennel (without the collar). It has definitely helped us to keep our dog safe and ensures he stays on our property.