Как живет бык в Зоопарке УдмуртииИА Удмуртия Classic trainers use corrections for instance a sharp snap to the leash, pinches, grabs and ‘alpha rolls’ when a negative behavior is seen, while most do Incorporate this with praise (and perhaps even rewards) for reinforcement when the proper conduct is provided. http://dogstraining95061.blogacep.com/2114714/dogs-training-leash-an-overview