Thank you for your reply.
I have known the dog for a couple of months, as i was employed to walk him once a week.This was the only excercise he had had off his running chain- so in fairness to him it is all new to him- this big wide world.
I adopted him 3 weeks ago as he had bitten the youngest child in the family as the kid had pulled hard on his tail, and within a week of that he had snapped his chain and lunged at a passing dog, knocking over the owner.
The previous owners thougth it was cute that he would ignore them and any commands they gave - albeit they never tried to train him. He made every decision for himself including food time as it was always there day and night.
Strangly the dominant behaviour he displayed at home with my other two dogs seems to have subsided considerably, as he was constantly putting his head over their necks which triggered several scraps- no injuries thank goodness.
He now plays well with the smaller of my dogs and generally doesn't react at all if the small one 'goes' for him.
The larger of my two was instigating a few probs by growling at him, but even that seems to be fading as they are keeping a mutual distance from each other now and seem to be giving each other a bit of respect.
I am pretty lucky to have a place to walk him out where we encounter only a few dogs, and sometimes none. I do have a garden where i can spend some time getting a bit of steam out of him prior to a walk.
I have also tried to do some road walking with him, which has been good so far and we haven't yet met any other dogs to distract us.
When we have met dogs on the country walks i have tried to continue to pass them without hesitating ( i think), but he will pull like fury towards them anchoring up which puts him behind me. At that point i put myself in front of him to distract him- it doesnt seem to work. On other occasions i have tried to get him to sit which he sort of does but his frustration grows and he becomes frenzied. Stupidly i clipped him one today- to my shame- and he went for me- so i did it again and he did back down.Not the route i want to take, as his previous owners used to whack him but not give him guidance. please don't judge me for that incident, as my reaction to him today led me to asking for advice on this site.
The poor soul has come a very long way in a short time, and he is a lovely dog. He is very intelligent and very willful at times, and it would be a shame not to get on top of the socialising in public with other dogs probs quickly so we can all enjoy a long life together.
We have previously adopted many dogs over the years, all shapes and sizes, including the other two, and of course they all arrive with different backgrounds and behaviours. We have had terribly unsociable dogs in the past whom remained muzzled whenever we were out in public, but they were much older and it would be nice if this one could be resolved as he is young and bright and full of energy, and we live near beaches and countryside where he could have wonderful freedom to run and explore if he could be trusted not to be aggressive.