I need some dog-people help here. B-man has been acting REALLY weird the last two weeks when we crate him before leaving for work. He shakes, hides, and has torn his bed to sh*t trying to get out. He's NEVER had a problem being crated in the past, and normally runs to his bed when we say, "Go to your bed for a treat!" Any suggestions on what would cause this dramatic change and how to fix it (leaving him uncrated is NOT a choice) would be very appreciated.