I'm not sure if this will help. But, you might try confining him to a smaller area when you have to leave him alone. 6 months seems a little too young to leave him the run of the whole house. Because he is still so young, he could get into trouble and hurt himself, like with electrical cords and such. I would try putting him in either a crate or a small room like a laundry or bathroom with a pee pad, litter box or whatever you use.