Hi Brucerit,
Your 14 weeks GS will soon grow to the 60-80 pounds so I understand you want to correct his bad habits sooner.
I don't think his jumping and play biting are the signs of "Alpha" or "dominant". They are typical puppy behaviors. Both behaviors are signs of excitements and happiness. Does he have a playmate? If he does, he would be jumping and play biting the playmate but he should learn this is not the way he interact with human beings. Jumping to a strange dog when he first meets is not a good way to greet either. He would be learning all these rules with other dogs so I hope he will have a lot of opportunities to socialize with people and dogs.
As for jumping you are doing the right thing by turning around and ignoring him. Another good exercise is to show him a treat high above his head and if he tries to jump up (stand up) to get the treat, say "Uh Uh" and wait until he sits down to give the treat. Create situations he would jump up so that you can reprimand and reward when he stops jumping.
For play biting, it is effective to say "Ouch!" sharply and firmly and stop playing (ignoring). Give him a bone or Kong or some chew toys instead. It is frustrating but you will just have to repeat this until he gets the idea of what he can chew and what he can't.
GS is not a Golden Retriever. It is a breed less friendly to strangers, can be more protective and sometimes fearful of strangers. I understand you don't get much company where you live but I strongly recommend socializing him as much as and as soon as possible to avoid future problems.
Good luck and please keep us posted on his progress.
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