Originally posted by aki
I hear all systems work pretty well. I think you can find the systems in most stores.
They don't work if you live in a snowy area. My neighbor uses one for his dog--Daisy. It works great in the summer, but she's been at my house every day, pretty much all day since it snowed! The snow insulates the wire so she doesn't get the little shock when she crosses it. Fortunately, she doesn't have to go anywhere near traffic to get to my place and she's a cool dog so I don't mind her hanging out.