Well, golly, I wasn't planning on a scorched earth policy in my own backyard. Just little land mines to blow off they're frikkin little paws, maybe singe a few tails as well. Just enough so a three legged squirrel named Stumpy will advise the other squirrels against coming over the fence to feast.
A free fire zone may upset the neighbors. Perhaps Punisher Industries has electric fencing in the product line?