
Dogs are allowed to bark within reason so if he is barking when someone knocks at the door or is shouting at a window as you suggested I wouldnt panic.
I have 3 dogs and would be more concerned if they didnt react by barking in that situation.
Having control is another story being able to tell them to quiet , teaching your boy to respect you and quiet on your command.
I agree with a lot of the posts distracting him from the situation and seeing what is ahead is a good start with a pup.
A lot of the training methods wont work if you dont get the tone of your voice correct ie: high pitch 'good boy' deep tone 'quiet' .
My hubby and I were watching sending in the dogs the other night and a police officer with his dog caught a criminal who was running away, the dog caught him etc etc afterward when the dog recieved his reward (his ball) the policeman said to him in a high pitched voice 'did you catch him ...good boy' my hubby and I both laughed as it just sounded amusing to hear this hard nosed policeman sounding all cute!
If your dog is treat orientated have a bowl of nice treats at the door if someone knock make him sit tell him wait / treat be consistent ..
You could try teaching the 'look at me' or 'watch' sit him in front of you hold a big treat near your eye saying 'look at me' when he looks at you ..immediately treat.. practice this then over time lower the treat to your waist only when you can say' look at me' he should still look up at your face then treat .
This then can be used on walks ..when you see a dog or person walking towards you 'look at me' treat until you are past .
I train all my dogs this way eventually you can loose the treat just a 'look at me' in the right situation makes life so much easier.
If he is strange to men maybe you should join a training class to socialise him with dogs and humans alike I am sure this would calm him down and not get excited by new situations.
Also look at his food what are you feeding him a high rpotein diet can make some dogs over exited and boisterous.
Roni