We used livestock fencing around our place. The holes start off very small and get bigger as the fence gets taller. We used eight foot stuff, but we bend about 18 inches at the bottom under and than tack it to the ground. It helps stop the digging under. It's not real pretty, but we live in the boonies so who cares?! It's also much cheaper than chainlink. If Photbucket ever decides to start working again, you can see some pics of our latest fence in my other thread.

Chain link is expensive stuff. We have some smaller areas done in chainlink, but it was used fence that was donated to us. Chainlink is also a real PITA to work with. It gets caught on itself and causes all sorts of swearing, well, it makes my hubby swear anyway!

I don't like underground fences. They don't generally work for huskies. We tried one one Muskwa before and it didn't even slow him down! They also don't keep other dogs, people or animals out. If you were only going to use the underground fence when you were supervising the dogs & you have dogs with good recall, it might be an option.