My Dog Drank My Choc Milk!

Our newfie ate like half a pan of chocolate cookies off the kitchen counter a couple months after we got her. (was 1.5 at the time) I tried to make her get rid of it and nothing happened. I was quite worried though. Now we don't leave anything out anymore on the counter. But now she's taken to staring at herself one of our little tvs. I sometimes wish we knew what dogs thought.