
Hi Guest,
Why not join and then you can provide a bit more info, ask more questions, reply to other posters etc :)
In the meantime it sounds as though your puppy is just feeling a bit insecure - this may be due to a fear stage (yes, they do go through this at varying ages, often hormone driven) but it would help if you could add extra info such as breed, how long you've had him, what sort of socialisation and training you've already done with him.
The main thing at this age is not to put too much pressure on a nervy youngster. You should gently and gradully habituate him with things that upset him but don't over power him with too many things at once nor compound his fears by fussing him for reassurance as he may associate that as a reward for his behaviour or you being equally worried by the noises/objects/situations.
Try and find a not too busy area, say a small village shopping precinct, and sit on a bench with him and let him become accustomed to the comings and goings of everything - don't force him to accept anything he is unsure of - keep him at a distance from things which upset him and gradually increase the length of time you spend and closeness to the objects of his concerns over a long period and only when you see signs of improvement. Also try and find a good training class with a compassionate instructor - not one who uses negative training such as shouting commands, choke chains, manhandling the dogs into positions.
HTH, but also hope you register - it's fun, free and lots of advice is ready to hand. Regards, Teri :)