PetSafe Stubborn Dog In-Ground Pet Fence System for Dogs and Cats - Wireless Electric Dog Fence with Adjustable Boundary - Choose Your Wire Gauge - Perfect for Large Yards & Stubborn Pets - Keep Pets Safe at Home

This is the rare product that is well designed, well built, and well documented. The installation instructions were excellent (in contrast to almost everything you buy these days). And, honestly, they need to be, because this is an electronic system that will only work right if it's installed right. If you take your time and read and follow the instructions carefully, you will end up with a system that works great.I needed to create a border around roughly 3 acres. In addition to this controller, I bought 500- and 1000-foot 16 gauge PetSafe wires (the 1000-ft. roll is not available from Amazon), and a second PetSafe receiver collar. My plan was to just lay the wire down on the ground, because digging a 1500-foot trench is a lot of work! Well, the first night two spots were chewed on through the insulation, and the wire had been moved in another spot. So we dug a very shallow trench and buried it. The whole project took a weekend.I was a little worried that twisting the wires together as a means of neutralizing the signal wouldn't work, but it worked perfectly; the collar will not go off even an inch away from the twisted pair. This gives you a good way to get from the controller (mounted in a dry location with power) to the property line. They suggest a trick where you use a drill to twist the two wires together, and that worked well too.The only way that I deviated from the instructions was in soldering and heat-shrink-insulating connections between wires. They do provide a solderless way to do it, but I'm more confident in my approach.Does it work? Yes! My two dogs wandered away at least daily before, and not once since. Their collars are only set to Level 2 (the mildest shock).I am not affiliated in any way with PetSafe, except that now I'm a fan.[2022-06-29 Update] The fence is still working beautifully after more than a year. I absolutely would buy it again, and my only regret is that I didn't install it sooner. My dogs never get shocked; a mere beep is enough for them to back off. Even when someone forgets to put on their collars, they are now trained and so they don't try to escape. It's great!