Dash knew he was naughty because he scampered right into his crate when I came into the room and saw what he did. Interestingly enough, I did not scold or yell (but I did say, "Oh my goodness, what have you done?"). I think he's smarter than he let's on. He knew he was guilty!
It has been said, "the closer the bond the more difficult the separation", Perhaps Dash knows he's going home tomorrow and is "acting out" in order to make the separation easier; although it's never easy to say good-bye to a loved one.