The best wireless dog fences help keep your pups safe outdoors. We tapped a professional trainer to choose our top 4 picks.

Dog fencing is important for the safety of our pets, but long gone are the days when we need to rely on physical barriers. Many dogs (I won't say all) respond very well to invisible fencing.

Plus, your yard will be much cooler with a green fence around it! You may find it hard to believe (because those sneaky dogs ...