Another recommendation for Bitter Apple here. That stuff works miracles!
Spray it on your wooden furniture and you'll never have a problem with the dog wanting to chew that. Likewise any woodwork in your house (cabinets and moldings, e.g.).
It is very normal for an 8 week old dog to want to chew; frankly they are teething. Surely you've noticed how a human baby puts everything in her mouth while she's teething Same thing with a baby dog.
Some breeds are worse than others. My mutt's mom was a labrador retriever--dogs which were bred to put things in their mouths.
You have to train him/her to chew what is acceptable to chew, whether it's a squeaky toy, rawhide bone, boiled marrow bones, pig or cow ears (for some reason, our dog loves cow ears, but not pig ears--go figure), Dingo bones. Whatever your dog likes. You have to experiment with your dog to see what his tastes are, but regardless--he has to be taught what is O.K. to chew and what isn't. He won't know the difference by instinct.
Either keep him away from what you don't want him to chew on, or spray Bitter Apple on it. Praise him when he chews something he's supposed to chew. Remove whatever (yes, your hand too) he shouldn't be chewing. Make a trade--give me my slipper, pup, and you get a peanut butter bone.
We fill my dog's chewed-up, empty marrow bones with peanut butter and/or cream cheese, wrap them in foil, and freeze them for treats that last and distract him. (His name is Max, so we call them Max Snax.

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