As for hot wire and chickens. Does it bother the chickens? Well, let me put it this way, I have a bantam hen called Sparkles NOT because she is a firecracker. When she was a fledgling, she managed to squeeze through the barbed wire fence.....just because she could......and when I found her she was trying to get back in but kept hitting the hot wire. She was dancing on it quite literally and when I picked her up I could smell singed feathers. I checked her feet and skin over two or three times. No damage. But her excursion earned her the name of Sparkles.
Now I watch and the young birds will inevitably stick their heads through the fence in a quest for a tasty morsel they see but once their beaks make contact with the wire that habit ends.
I finally netted the bottom two feet of my run and that ended the problem both of young birds escaping and heads through the fence. So if you are using a hot wire, I suggest that if your fencing is chain link, or something the birds can stick their heads through, you do the same.
Does it hurt them? No lasting damage but it is uncomfortable for them as it will be for dogs or wild life that tests it.....even for you if you somehow make contact but hey, good way to tell that your fence is working.