A lot of animals are smarter than they are given credit for. Example, one day my wife was making food and we have a bar like area that separates our family room from the kitchen. Our new puppy, only 9 months old, decided he wanted the Milk-bones on the bar. He was not tall enough to get it himself. You know what he did? He actually moved his crate over to near the bar, and jumped on it to give him the extra height he needed to get the Milk-bones.
We were not in the room at the time, though we noticed the Milk-bone box on the floor, him crunching, and the crate moved. He was not smart enough to cover his tracks.