Shock collars work extremely well (if the dog is trained properly on it).
You have to train your dog for about a week to establish the boundary, it works so excellent, we had a trail 10 feet in from the wire that the dog created running his property patrol laps for the first year we had the collar.
I have 1/2 mile of wire around our place, it worked well on our dog (Lab/collie/shephard mix) for over a year, then he decided it's time to outsmart the collar, he would sit in the warning zone until the beep ran the battery down, after that, he learned that he was free. After a while of replacing batteries, he decided that running through the zone wasn't too bad for the reward (freedom) on the other side and beat sitting in that "noisy spot" for 2 days, he even came home through the zap before us so we would not get wise to his mischief - thank god for the telephone calls from neighbours alerting us.
So, to end this nonsense, I bought the stubborn dog collar, he doesn't go within 40 feet of the wire anymore, and he learned real quick that running down the battery is no longer an option since the stubborn dog collar is smart and zaps if the dog continues to stay in the warning zone for more than 10 seconds.
Once again, our dog is free to roam our land, but tied enough not to leave it. We have a new trail around the perimeter - 30 feet further from the wire which is his new patrol loop.