
I would suggest that he is walked before being left, so that he is more likely to be tired. then crated him with a marrow bone, pigs ear, hoof, whatever will likely last the time he is left. Put the radio or Tv on where he is, preferably a talk channel!
When at hom he should be put in the crate for short periods, so that he is used to time by himself when it is possible to make sure he stays quiet. He should not be let out until he has quieted after being told to do so.