It sounds like he is having a bit of separation anxiety! He gets upset when you leave him home alone! I know how frustrating this is for you, because you obviously HAVE to leave him alone sometimes! I'm no expert on dog behaviour, but others here ARE ... at least in my eyes! I wish you luck on getting this figured out! My only thought would be to give him a brand new bone right before you leave each time .... at least for a while! Maybe he will be so busy enjoying his bone, that he won't notice he is alone? Just a thought!

Kim