He bites - flip him on his back and make him lay still and don't let go until he is calm. The more the pup wiggles the harder the down pressure.

I use one finger on the snout saying the word NO. And persistance/constant postitive repitition is what you need. Just keep at it.

Remember at this age they are jut like 2 yr old kids that like to put things in their mouth as they learn. Let him have his own chew toys.

JW