Are Invisible Dog fences Good? Do They work?

they work great!!! Excipt with hyper dogs they'll get out no matter what

We got one for Sadie, and it works perfectly! We taught her her limits, she crossed them a few times, and never has. The only thing that would get her out of the yard is when my neighbor's dog, Ginger, would come over and taunt her till she chased after Ginger. But Ginger was hit by a car and killed(:() a few months ago, so we're good.

I don't know about with a big dog, but Sadie is 50 lbs and we have to set it kinda high to get her to stay in. Even when she doesn't have the collar on, she will not do near the line. It's nice knowing that she's not gonna turn up on the side of the road like Ginger.

-Melanie

After the correct training is done and if everything else is kept up, these types of fences still have a very high rate of failure for dogs that have strong drives/motivation to do their jobs or perceived jobs.