I usually pull him back and give him a heel to his chest and tell him to back up,
do it a couple of times and they will get the hint not to pass you while walking and
and shorten the lead in your hands and he will follow you and not pull you been doing
it for years!! easy for him to follow you thru the briars when the lead is short, can stand a
catch dog pulling and huffing and puffing!!!!

but always keep him walking behind you,
eventually that heel will start sting his chest alittle..