[M_Six]

The neighborhood across the way from us has 20 homes on acre+lots. Some have more land. At least 15 of those homes have dogs. All have invisible fences. I have never seen any of the dogs outside their yards, and we walk a route through that neighborhood twice a day. Some of the dogs come charging up to the edge of the property snorting and snarling and barking, but they always stop short of the property line. I'd say the invisible fencing is pretty damn effective.