There are several ways to install an anti-escape fence for dogs , here are some diagrams.

Land with a traditional fence, the anti-escape system covers the front of the land only.

Anti-escape which covers the entire ground with access prohibited in the era of games.

Anti-escape system which gives access to part of the ground, either the rear or the front.

Anti-escape fence installed with double wire (double loop), gives access to the rear of the land only.

The double loop can also be used to provide access to a place like a lake.

You must leave a minimum of 3 feet between each wire, if the wires touch it cancels the signal.

The flags indicate the limit not to be crossed, they must be installed during the first two weeks, when the dog is learning. The audible warning is made from the yellow line and the correction, from the red line. The green wire is the twisted cable. In this case, the transmitter was installed inside the garage.

In each image you can see that part of the wire is twisted, this part allows the dog to pass without receiving correction.

See also the article, how to twist cable for an anti-escape fence.