There are a TON of Invisible Fence yards around here. One house in particular has three huge Rotts that charge the line when I'm out running. No problems so far, but there's no fence or leash law where we're at, and I've already been charged by a BIG gsd whose owner apparently didn't believe in any fence, invisible or otherwise. His owner wasn't happy when I ran him back into his own yard with his tail tucked. I told him to keep his dog under control or next time he'd be calling the emergency vet. He seemed more upset that his dog ran away from me than he was that it got away from him.
I choose to not bring my dog with me because of this crap. How hard is it to spend the money on a good, high fence?
"My first priority will be to reinstate the assault weapons ban PERMANENTLY as soon as I take office...I intend to work with Congress on a national no carry law, 1 gun a month purchase limits, and bans on all semi-automatic guns."-Barack Obama
"When in doubt, whip it out."-Nuge