Your puppy is neither defiant nor dominant. He is simply a puppy. Check out the puppy section on this board. There is lots of excellent information and also lots of threads just like yours with strategies for teaching bite inhibition (very important for a pup who has left his litter so young) and dealing with an energetic young pup!
Ruth & the 4 Legged Rescue Gang
Rafi the malaroo
Gio & Varda, the krazy kittens
....In my heart: