I have seen this in action. The dogs stayed in the yard after they disasemble the fence.

Pros: works most of the time

Cons: not fun to set up

We set up the fencing and then began the training with our dog. She did ok with the flags and the beeping but you need them to get shocked once so they know what happens if they cross the line after the beep. When she got shocked she basically jumped into my husband's arms. After that she would not even go in the backyard. IF we took out the collar in the house she would hide under the dining room table. I know this system works for a lot of dogs but it did not work for us at all.

Pros: If it worked it would have been great

Cons: Scared our dog