You dog is thinking that you are just one of his littermates and wants to chew and play rough with you. DO NOT play tug of war with him (this tends to make dogs more aggressive.) He must know that you are the leader and he must obey you.
I would start also thinking about puppy class. He will have fun
and you can learn alot more from your trainer. Even though your
dog will not weigh a 100 pounds--like a rottweiler, he will still
cause you alot of grief if this kind of behavior continues. He
will be snappy especially with children, not listen to you, and
do whatever he wants whenever he wants to. I know people who
don't sit on their couch because the little dog will bite them if
they sit on HIS couch. This is not a relationship it is slavery
to the dog!! Best of luck to you,
PUG