[shrug] Invisible Fence (https://www.invisiblefence.com/ https://www.invisiblefence.com/) has been a thing at least since the early 2000's when we had one for

[shrug] Invisible Fence (https://www.invisiblefence.com/ https://www.invisiblefence.com/) has been a thing at least since the early 2000's when we had one for our dog.