im against any liscensing partly because it without a shadow of a doubt wouldnt work and partly because we should all only be responsible for ourselves.
that said for me the dog has to be 100% under control,with my lurchers that means they stay on lead in public and for my stafford it mean's he never given the chance,his lead goes on his collar before the chain comes off before walks,the only time he isn't restrained by a lead or chain is when he is in the house with us,which isnt more than once a day.