Good...Shameful. The dogs would have to be injured pretty severely and probably multiple times for them to stay away from those nails.
Wait, isn't it the job, infact law, of the dog owner to keep them under control? Why should I have to keep my livestock locked up in a coop, inside my fenced in area when the owner of the dog is breaking the law...Gross. Take that energy you put into coming up with booby traps that injure animals into simply securing your own flock or don't free range.