WRT children and electric fences - modern electric fences produce very short high voltage, low current zaps once every second or so. It feels like a real bad static electric shock but I've never seen a dead animal near a fence.

I grew up in the countryside in rural New England where lots of people had cattle fences and I spent a lot of time playing unsupervised out in the meadows and orchards where fences criss-crossed everything.   And I never got zapped or even heard of any kids getting zapped.   Our parents told us that if we touched that thing it would set our finger and toenails on fire, and that was good enough for us!