Here is a smart wearable system that helps you keep a close eye on your dog. The SpotOn GPS Dog Fence & Collar lets you customize up to 20 fences from 0.5 to over 1000 acres. Since there is no hardware to install, you can create fences anywhere.
To get started, simply draw the fence in the app and add keep out zones. When your dog leaves safe areas, you get notified on your phone (with optional cellular plan). SpotOn connects to 25+ satellites to give your dog’s location within 10ft. The battery lasts up to 14 hours in tracking mode.