You don't need to establish yourself as "alpha"! Your pup will know you are, because you are providing everything for him.
Also, I was reading another thread about playing rough with your dog which most people seem to have no problem with. I was told by a friend that playing rough and wrestling/pinning the dog down will make you seem like you're the one in charge. Is this true? Sometimes when he bites me I'll use my hands to close his mouth and pin him to the ground
Love your pup, play(train) with your pup, tug with your pup and wear him out! He wants to be with you and everything you do should be building his confidence not showing your superiority by doing what I posted in the quote box.
If you want a stable,social, confident dog, showing your dominance now will squash it. Get a flirtpole and tie a rag or ball on the end of it for him to chase, lay his kibble in a 'track' or toss it around the yard for him to search for it. That will wear his little mind along with his body. Tug is great fun, and let your pup win...you control the game by ending it when you want.
During teething time, tug should be put on hold however.
When you see your pup doing good behaviors, be sure to reward them! If pup is doing unwanted behavior, redirect him to something else.
You can get elk antlers for chews fairly cheap here:
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They last forever and are not harmful/won't splinter.
Your vet is telling you it isn't safe to poop pee outside? As long as you go where random dogs don't wander, I think it is fairly safe for your pup to be out....just don't let him drink out of puddles and supervise him.