Even big animals. I found my friends horse caught in the electric fence - she must have slipped and fallen and the top electric wire had got caught between her shoe and her hoof. I saw her in the distance and thought she was rolling, then thought she was fitting then realised, as I got closer, what was happening. She could only have been lke that for 15 minutes. She did survive until we cut her free and got her into the barn on a buckrake but she had to be pts that evening because she was brain damaged.It was horrible; I still can't think about it without crying. If she hadn't had shoes on, she would probably have been OK.
Hope your sheep is OK.