Set up a confinement area, a place your dog will stay when you can't provide 100% supervision i.e. when you're out, or busy around the house, and can't watch him the entire time.
The ideal confinement area should be easy to clean and easy to close off with a door or baby gate. It should be mostly free of furniture and non-dog related objects (remember, everything is a potential chew toy to a dog!). The best place for a confinement area is the kitchen, laundry or utility room, porch, empty spare room or small indoor/outdoor area.
Furnish the confinement area with a bed or a crate with something soft to sleep on, a water bowl and several toys, including a favorite bone or chew toy. Note: The confinement area should be the only place your dog gets to have his favourite toy. You might think the word "confinement" has a negative connotation, but your dog's confinement area is not a negative thing. It's positive. The confinement area is a place your dog can call his own as he makes the transition to his new home. It's where he gets good things, like meals and his favorite toy. It sets him up for success in the process of housetraining and alone-time training.
People often give a new dog complete freedom right away. Then, when he has an accident or chews the wrong thing they confine him and confinement becomes punishment. If you start out giving your dog the run of the house, you're setting him up for failure. Better to give him a safe, confined place, so he can make a gradual and successful transition to his new home.
A crate is a valuable tool for a new adopter. Like a confinement area, a crate eases the process of housetraining, chew training and alone-time training. It helps your dog make the transition to his new home.