Manchester dog fight illustrates problem with invisible fences

http://www.unionleader.com/article/20120526/NEWHAMPSHIRE02/705279950&source=RSS

Now I agree that invisible fences are worthless. HOWEVER, in this case the attacking dogs owner was not able to control her dog and the dog went on the victim's property so in this case the attacking dogs owner is at fault. If you know you have a dog that is easily threatened, it is you responsibility to contain/control it. Also, on the flip side, we all know of dogs that, even with a physical fence, will still find a way to get over or under the fence to attack another animal.