My puppy's tail doesnt wag.. worried - Page 1

my 5 month old golden retriever dog never wags his tail nor does he react to any member of the family coming home or making an appearance unless we ourselves try get him excited to which we get some response. He went to a week of training where he learnt to walk properly on his leash and ignore other dogs when bound to his leash as well as the word NO which we use when he constantly bites due to his teething. Every member of the house disciplines him so its not one person in particular.

What could it be..

Are you worried about his body language in general, or is his tail physically not wagging?

I'm with VKGSDs is the problem that his tail does not move? Or is the puppy submissive and low key and tucks his tail when he sees people rather then go crazy and wiggle everywhere?
A tail not moving could be a sign of injury. On the other hand a pup who is very submissive or frightened may not feel safe to wag his tail and instead tucks it.
Fry

Has he ever wagged his tail?
Did he slowly stop wagging his tail as he got older?
Did he stop wagging his tail after he came home from training?
What does the rest of his body language look like? (example...ears alert?.....head up?)

Every golden I've ever known has been a vigerous tail wagger......On the other hand they also sulk and act crushed if you give them a correction. 

He went to a week of training where he learnt to walk properly on his leash and ignore other dogs when bound to his leash as well as the word NO which we use when he constantly bites due to his teething. Every member of the house disciplines him so its not one person in particular.

I'd take the dog to the vet and make sure everything is ok, first. His tail / spine could be injured.  If everything is "ok," I'd stop telling him "NO" all the time and let him be a puppy. If every member of your household discplines this puppy, he's probably not real excited to see any of you.  I'd spend more time playing with this puppy and teaching things positively.  Puppies really don't need any discipline, they just need to be praised when they are correct more than anything.  Dogs are likely to repeat behaviors that are reinforced.  
 

" Every member of the house disciplines him..."
Maybe he is not happy and quit wagging his tail cause he is being disciplined without knowing why. Maybe his life sounds like; nonononononono!

I am completely with slamdunc on this one.

check him out at the vet immediately- 

this behavior sounds very unnatural 

puppies should be allowed to bite- just not people- so saying no is poor whereas inserting one of his toys is better, which is redirecting their energy not squashing it

How sad this puppy sounds. This is NOT right.

dont presume a family member isn't being too hard on him and don't presume a trainer did not harm him

 

Re Bravo's last comment, about you can't assume some problem was not
caused by the trainer, I was going to ask (cos it's not clear):  was this a
week of training where you sent him away to someone else to Train,  or
was it an intensive course you took him to yourself ?

If the former, while the trainer may not have hurt or upset him in some
way, the dog may just be confused because he'd spent a week with one person
and then comes home to you and your family, where  you might not be using
the same methods / cues.  Is that a possibility ?

Maybe you could check that out - after taking him to your Vet, if they can't find
anything physically wrong.