Once he's tasted blood (which as far as I know, he hasn't) you can't do anything, you'll have to have him put down.

Seems a bit hard core. I'm sure Boxer Rescue could find a new home in an urban area (not too many sheep to worry there). It's wierd to hear of a boxer that would attack a sheep anyway - they're all over playful and curious as hell but they don't tend to actually bite things.

Rob