I just moved from a fenced yard to an open yard/duplex neighborhood. My dogs were being chained up throughout the day and constantly getting their chains tangled up, etc. I bought this and I'm currently using it for my two little dogs, both are chiweenie's...it took my dogs about an hour to be trained!! They do NOT like to get zapped and stay within the parameters. It is so easy and nice to just let them run outside the back door and not have to spend time untangling their chains, etc. It also gives them more room to roam. I just bought another collar for my beagle, she is very stubborn, so I'm interested in seeing if this will work on her or not.