We had some adults cats given to us by a customer of my husband and they chewed hundreds of electronic cords ruining many electronics. I couldn't afford them to destroy one more electronic device and cats are harder to train than dogs. We had no choice but to give them back to the lady. First of all this is what puppies do - when Bella was a puppy she chewed many things like the dining wood chairs, clawed the wall down to the dry wall, shoes and eating several non food things.

The first thing you need to do is crate training - so when you're not home he can't destroy things. If he's alone too long then enclose him in a small safe room - safe meaning so there's not things he can get into to. You can get him a nylon chew bone so he has something good to chew. There are also these great plastic toys with holes and you can put treats in them - the dog has to roll the toy around in order for the treat to fall out. This takes time and helps with boredom. You don't want to give total freedom to a puppy when you're not home.

Also make sure your puppy gets adequate exercise - dogs get hyper if they're bored and restless. The next thing to do is train your puppy the 'leave it command' and the 'drop it command'. Bella still gets socks and the occasional inedible item and all we have to do is say "drop it" and we reward her with a couple kibble. When your puppy's out, keep an eye on what he's doing. Its very normal for puppies to chew, so its important to give him a safe chew bone and chew toys.