My Akita also chewed everything. What we found that worked best was to always have them in your site. If you can't trust them to run around by themselves (which we can't) maybe buy a puppy play pen so you know where the puppy is and know it's can't chew anything it's not allowed. Or confine the dog with a baby gate to the room you are in. Dog's are not suppose to be left unattended in the house until they are 4 years old. By then they should know the house rules and respect them.
Another thing you might want to try is bitter spray. It works really good. The only bad point to it is you have to recover things every few days because the taste wares off.
