Cant control lab when walking

Question
QUESTION: I have a one year old intact male lab. He is very intelligent and friendly and weighs about 55-60 pounds. He has been walked since he was a puppy. Now, he can pull me anywhere he wants to when wearing a choke collar. I have tried the hard yank, the stopping and waiting for slack to no avail. I bought him a halti collar which was much better, but he has learned how to slip it off his nose. We just came back from and incident where he got the whole thing off and was running happily in the middle of a busy road. I have had many dogs (I recently lost my curly coated retriever from old age) and I have been able to train them easily. My boxer and curly were both intact males with no problems. What do I do?

ANSWER: Have you tried going to a training class?  Even when you have experience with dogs, a trainer can help you work on issues with a particular dog.  

I would also go with a prong collar.  I have had alot of success with them and while they might look barbaric, they are very effective tools.  I find that I don't even have to correct the dog when they wear the prong.  If they pull, they actually self-correct themselvs, and fall back in line at the right spot for heel.  

---------- FOLLOW-UP ----------

QUESTION: I will try the prong collar...thanks! He is from field stock, would that make his temperment different than show stock? Does the fact that he's intact have anything to do with it? AND (probably a silly question) Digby is a yellow lab, do the different colors (black, brown, yellow) have different temperments? He knows sit, down and stay, but heel is another story, he wants to play with everyone he sees.

Answer
No, color has nothing to do with it.  Field stock "could" have something to do with it, but typically field lines have more drive which translates to hyperness if the dog is not trained and doesn't have a "job".  A "job" could be that you take him out for 1/2 hour of retrieving daily.  I have a field lab, and she really needed training (not for sake of needing the training, but the routine of working) and we played with her daily at the same time.  The routine really calmed her down.  Being intact probably has nothing to do with it.  Most of my dogs are intact and learned to walk on a leash just fine.  Some on flat collars, some of the prong.  It has alot to do with the personality of the dog too.