Does your dog have a fit when you leave the house? He or she may have separation anxiety. This is defined as the dog performing certain behaviors (like excessive barking, attempts to escape, or being destructive) only when the dog is left alone. If your pup seems to be worried about you leaving, try the tips in this article http://www.whole-dog-journal.com/issues/15_9/features/Desensitizing-Protocol-and-Separation-Anxiety_20604-1.html?s=FB042114. This is a terrific way to start working with separation anxiety. It takes some time and patience, but with consistent practice, your dog will soon be comfortable with your leaving the house.