Our dog's invisible fence boundary wire has degraded to uselessness. It's been getting flaky when the ground's wet for a couple of years. It was cheap wire that came with the old cheap system we got at Lowes years ago, and the insulation degraded.
I'm now burying higher quality, 20 gauge solid, direct-bury rated wire. I've got 100 out of 1500 feet done so far. Now that I've got it figured out how I want to do it, I expect it won't take more than 6 hours or so to do the whole thing. The ground is quite soft right now, soft enough that I can simply rip the old wire out by hand and follow the same gap in the ground with the new wire, with just a little bit of opening it up with a hand tool. The first time I did this, the ground was hard as a rock and it was quite difficult, and took several days.
I'm now burying higher quality, 20 gauge solid, direct-bury rated wire. I've got 100 out of 1500 feet done so far. Now that I've got it figured out how I want to do it, I expect it won't take more than 6 hours or so to do the whole thing. The ground is quite soft right now, soft enough that I can simply rip the old wire out by hand and follow the same gap in the ground with the new wire, with just a little bit of opening it up with a hand tool. The first time I did this, the ground was hard as a rock and it was quite difficult, and took several days.