I have a wireless dog fence and it does a great job of keeping an 80# weimeraner contained. I need to get longer probes for my lab because she will cross the boundary and go take a dump in the neighbors yard. If I put her collar on tight, she gets zapped and comes back in the yard.
I have a pet safe wireless instant fence and I spent $279 for the unit (comes with one collar) and $125 for a second collar.
What he said. We also have the Petsafe kit, covering nearly 1500 feet.
Ours keeps 2 labs and a GSD in. The trick is good training and the longer probes. Most fence systems have a control that adjusts how "wide" the line is. Turn it up, and the dog gets hit with a tone, then a shock. Wider the line, the sooner the correction. Problems solved.
They also make collars that run on 9v batteries that give a stronger shock. Had to get one of those for our GSD, he's stubborn and didn't have the learning curve of the labs.
Since we've had the invisible fence, the dogs haven't run off. And that was an annoyingly consistent occurrence before then. Now, the dogs can go out without the collar and they don't go near the boundary. Even with the random cat or neighbors chickens taunting them from the other side