A Warning About Invisible Fences

Invisible fences let you set up a boundary with wires that work with a shock collar. If your dog crosses the boundary, he gets a shock. I've had several trainers and vets tell me not to use these. If there's something really tempting outside the fence, your dog can still get out to go chase it if he's willing to suffer the correction. If he tries to cross back over to come home, he'll get a shock, so the fence ends up keeping him out.

It also doesn't keep out other dogs that may be roaming loose. A dog can come in and attack your pet and your dog is somewhat trapped; whereas the other dog can maneuver without the boundary bothering him.