Expect every healthy puppy to be mischievous. You could as well make up your mind to it and not worry. Worry more if your puppy is so good he never shreds anything; brace yourself, for he is below par!
When we say that puppy mischievousness isn't a fault but a virtue, we can hear protests popping up on all sides. But a dog's teeth are considered his fingers, and he must use them if he has the normal energy and curiosity of a healthy young animal. Books and magazines within reach would be gnawed; that hanging corner of the tablecloth willbe jerked unmercifully. The world is his, and everything he can grab is a toy to play with.
There is just one way to avoid a lot of trouble. Keep things out of his reach. You can't teach him yet to leave certain objects alone. So make sure to furnish safe and interesting toys to push and pull and tear and wreak his small vengeance on; and then take away all else from his inquiring
A special warning regarding base plugs: electric outlets having their wires attached are fair game for any puppy. He will try to chew them, and perhaps cause a fire or shock himself. If your puppy does get a shock from chewing through an electric cord and turns unconscious, don't touch him when he is in contact with electrical current. Unplug first the cord from the wall. If you are unable to, wrap a towel around your hand, a broom handle, or use a pencil, or some other nonconductor of electricity to force the wire out of the pup's mouth. Wrap him using a blanket to keep him warm. If the dog isn't breathing, start artificial respiration then get to your vet as soon as possible. Another word of advice: don't drop paper clips, rubber bands, and other small items on the floor, because they could get into a curious puppy's mouth and be swallowed up.