It REALLY depends on the dog. Bottom line.
We co-owned an Akita "Bubba" who would stay behind it 99% of the time, but when he decided, he would buck up, and go right through it. That was way back when the invisible fence was still patented, ooober expensive, and they came out to "help the non trainers" train their dogs. That sending out a trainer thing is why the product is still around I think. Without it the product may have failed to go nationwide. That being said training is a vital step. But never forget -if a dog wants after something -most will find a way no matters what kind of fencing. Electric, or blockade type.
In our area anything with a somewhat almond eye, rounded jaw, or athletic look without a curl over tail (then they are labeled chow mixes) is labeled a "pit" by our media. PETA headquarters being in our backyard, and all, so I won't do it with my bully, cause of the BSL
threat. That is my choice, I KNOW my dogs -big & small -are what I call non-aggressive defenders. While they are not aggressive dogs they WILL meet a threat head on. The last thing I need is one of these dogs ppl like to drop off out here in the country to be livestock /ppl aggressive, and my dogs defend our persons & property. BC all you will hear is my pitbull killed an innocent dog. NOT that my dogs were defending my family, or thousands of dollars in livestock were defended efficiently by insuring there would be no repeat threats from the loose animal. Ya never hear that.
Well bred pits & bullys are very efficient dogs who approach things as all, or none. From jokes to threats. Mud to baths. Car rides to nap time. Everything with gusto!
If you plan on living way out there like us,or in a neighborhood should weigh in appropriately to not only keep your dog safe, but also keep BSL
at bay. I keep fenced areas, and some chained areas for a as needed basis, but most of the time they are free, and like to stick with us.