If they are taking and stealing the firewood out from behind your shed, you should move it closer to the house and buy a Rottweiler. Those punks need to learn their lesson the hard way. So, while you are at it, buy a paintball gun and freeze the paintballs. Then, pelt the holy-crapolla out of them.

...What was the question again? I don't think I was paying any attention, sorry for the misunderstanding. But, if you have firewood and it is getting stolen, maybe you should do what I recommended.