The "Invisible Fence" system we had worked for our Lab-Retriever mix. Like one of the above posts mentioned, you do not get any warning that the battery is dead. You'll only find out when your dog doesn't slow down at the fence line. Then it's back on your quad with the lasso.
The training is a requirement also. I seem to remember putting up small white flags that maked the line and you were to walk the perimeter with the dog. Then you would start removing alternate flags on a regular basis while still regularly walking the dog. Ultimately the flags are gone, but the dog knows the limits.
I do know an individual that had a real stubborn dog that ultimately had two receivers/shockers placed on one neck collar so that contact would be made on the back of the neck as well as the front. This ultimately worked.
If the system works for your dog, there are neat things you can do with it. You could have an area within your outer perimeter that would also be off limits to the dog. A pool for example could be off limits, yet the dog could roam the rest of the yard to the outer fence line.
First things first though, see if it works for your dog.
Hope the information helps.
Our dog died a couple of years back. I just looked in the garage to see if the equipment was there, but we must have sold it in a garage sale. I'll look some more and if I find the stuff you can have it. Just don't hold your breath counting on me finding it.
Good luck.
John
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 1950 CJ3A. Oddfire 225 V6, T-86 transmission, Dana 18 transfer case, 4 wheel disc brakes, locked front and rear. Manual saginaw steering. Warn winch, 9,000#.
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