2 words...... shock collar...... http://www.sportdog.com/dog-training I had major issues with my bulldog killing my chickens....chasing my cats to kill them.....chasing the horse.....messing with the goats....... now.....he is a gem.....it only took me a week of precisely timed hits from the e-collar and ta-daaaaaaa.......now he is a well behaved gentleman and even protects my flocks and searches for predators....