My red & white grew out of chewing up stuff when he was about 4. He had mastered unzipping the couch cushions and destuffing them! It was his duty to destuff any couch with a zipper!
My female will be 8 next month and she (I'm afraid) will never grow out of destuffing/chewing! Small hole in a comforter, no problem, let's make it bigger and destuff it so the room looks like snow! Toilet paper, hanging on the toilet paper dispenser? Never in my house! It only lasts 2 minutes and then it is set on a path of distruction…down the hall....in the living room.....in the bathroom.....on the bed.....
Unfortunately, she is teaching the toilet paper destruction to my almost 3 year old rescue. But he doesn't shred, he litteraly eats anything he is destroying.
We have had to be extra dilligent to keep chew dangers out of his way. He is tiny for a male (20 lbs) and we don't want him to ingest something and not be able to pass it.
I echo everyone else's statements. It's like baby-proofing your house, except it's basenji-proofing! And when you catch the chewing something they aren't supposed to have, scold them and give them one of their own toys. These are intellegent dogs, they get it....after a while!