Well, I just have the one, and when she gets hurt in any way, she cries like she is dying. I have electric fence around my chicken run, and I have bumped it, and yes it's a bit of a shock, by my goodness. Ruby bumped it and ran around the entire yard crying and yowling.

She has an invisible fence and has broken through it a couple times, but it's more of a buzz compared to the fence around the chickens. Anyway, we're trying to get her to allow us to trim her nails so I don't have to take her to the vet for that. We even got the little sander they have been advertising on tv. I KNOW it doesn't hurt. Oh well, what can I expect from a dog who whines the whole time she is getting a bath? She carries on so much that one of the cats has to go into the bathroom for moral support.