I trained Wallace my field spaniel around sheep and on a 10 meter line. I used to go looking for them on purpose just to do some training. I also trained in other less distracting places of course.
He chased sheep once, catching me completely unawares, so really put the hard yards in with him to make sure he never had the chance again before I really got the recall into him.
I thought his recall was spot on when he chased sheep but then i had never trained him around sheep so needed to put that right.