He went to get his own firearm, but by the time he returned, the dogs had gone back inside their own fence. The Davidsons did have a fence, yet it wasn't secure. In light of the escape of the Texas-7 from a government controlled facility in my home state, I don't really see how more legislation would have ensured that this fence, too, was better secured. You see the problem lay in Ms. Davidson's own actions and negligence. That is where the problem starts and ends.
Fences can fail.
Privacy screenings won't stop the auditory stimulation that is received. But proper training and socialization would have prevented the accident. That attack was witnessed by a school bus full of terrified children, a driver incapable of stopping it, and a brother who refused to come down from the tree in the first place. The owner never even woke up after police arrived on the scene and fired shots killing 1 dog and wounding another. She was not responsible enough to own a dog and was criminally negligent.