As your runs get longer, he *will * adjust. Our beast used to trot over to the creek, then come back to our side, then chase a squirrel, then come back, then chase a bunny, then come back… Eventually he realized that the runs were frakkin’ LONG and if he got tired, too damn bad, Mr. Let’s Chase a Squirrel! So he fell in line with the rest of the “pack”.
It elped though that he was already trained to heel, so if he was being too big an idiot we could keep his hairy ass next to us.