I leave my Nikko alone for about 10 hours a day but I keep him in the kitchen with a baby gate along with his food, water, toys, wee wee pad (which he sometimes tears to shreds
)and little cushion. If left alone he would destroy my house, not to mention probably hurt himself by chewing on wires or other dangerous things. You have to start limiting your dog's freedom and be more firm with her/him. Like everyone else said, maybe you should invest in some obedience training. A little patience and a lot of love go a long way too. Good luck!!