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

Invisible pet fencing keeps your dog within the confines you set via an in-ground wired system ... Also, an invisible fence won't keep other animals from entering your yard.

For large yards, GPS dog fences win hands down ... Wireless transmitters don't have the range to cover a lot of ground. Sung Vivathana, co-founder and vice president of SpotOn Fence, says his ...