
Sounds like great things have been done - way to go with your lad, huge congrats :)
I'd treat socialising him with children in much the same way as you would have done from puppy hood. Slowly, steadily and at a distance initially - let him observe them for example in the play ground during mid-morning breaks, but keep a fair distance between him and railings, hedges etc surrounding the school yard. Just let him get slowly but surely used to the unpredictable squeals, screams, shouting and bouts of laughter etc that are part and parcel of youngsters going a little OTT on a short respite from the classroom :) Gradually work a little closer so he can view them running around, skipping, playing ball, races etc (OK, maybe loitering with their Nintendos :rolleyes: :D ) but dont push the boundaries - work at a pace where he is not being scared or anxious by the sounds and sights ;)
I apologise as I cant remember if you have children of your own but if so, encourage them to bring friends around although keep your boy safely away from them and simply allow him to get used to their behaviours, sounds and scents. If you don't have children of your own, perhaps enlist the help of friends or neighbours who you can trust to ask that their children will respect and, ideally, initially ignore the dog while you go through the slow process of building his confidence around them.
Always make sure for safety that he is not directly approached by children - as you know already, when restrained / restricted from escape in some way he is upset so it is important to work on distant management first.
What does his >
anti social showing unacceptable behaviour< entail? Does he growl, bark, etc? In his former life he may have been ill treated by a child/ren so it may take a lengthier period to desensitise him to kids in general.
You've obviously done a great job in a very short space of time with him so just try and see this as your new - but attainable - challenge! You can do it (and we can help :) )
Good luck, Teri