Today my lab ate my son's lunch box- again!

We have a little problem with our lab. He isn't supposed to eat people food, but he doesn't seem to remember this. Ok, it has gotten to be quite a big problem with him as is evidenced by this blog history (see Today my dogs ate my daughter's guinea pig or Today my lab ate my Christmas present). You see, today's problem started when my son saved some of the ham from his lunch for later. He told me this but I forgot. Oh, the things I forget. I put the lunch box on the counter and left it there. When my son decided that it was time to finish the ham, he went to get it and then I heard a scream. I knew immediately what had happened because (I must admit) this was not actually the first time my lab ate his lunch box. In fact in recent history, this old dog has taken meat that was thawing out of the sink; he had the audacity to take a sandwich out of my hand (oh, yes he did); this dog has swallowed a lump of play dough whole when my son was playing with it at the kitchen table. He is so bad now that he is eating things that aren't even food in the hopes of getting something good- that is bad! You would think I would have learned by now not to leave ANYTHING in his reach, but I haven't yet. Be honest, you know you forget things too. However, I must admit that I have to take some of the responsibility for this problem. Our lab is almost 11 years old and awhile ago I decided that I could relax a little about disciplining him since he won't live much longer. Well, two years later I realized that he is still going strong and we have a problem. My lab didn't always disobey like this. He started small (OK, an entire casserole wasn't small but it was easy to get to that day) and slowly but surely he became sneaker and more persistent in his attempts to get our food. It wasn't a sin of opportunity anymore, this behavior became something he would think about and plan. He watches us and as soon as we aren't looking he strikes. We have to post our children guard over the food on the table if we need to leave the room. Our lab is now making a concerted effort to disobey. But that make me wonder, where in my life am I allowing habits to form just because it is simply easier to do something wrong? What behaviors do I have that have slowly slipped into becoming a problem? I usually react without thinking when other people brag about their kids- am I gracious or do I turn around and brag myself? What do I do when I am driving and someone cuts me off- do I ignore it or do I become angry? I need to examine my life and see if my habits have slowly crept into something that is wrong. It is so easy for that to happen. Just like our lab started out eating small bits of food when he shouldn't and has now moved on to very bad behavior, have I let something small turn into sin? How about you?