When not properly used choke collars put a lot of pressure on your dogs throat and can cause damage to the neck, spinal column and throat. A dog being trained with a choke collar will receive 1.000's of corrections in his lifetime. A dog being corrected in this manner, this often may get hurt and will not learn to trust his owner the way he should. Using positive motivation inspires trust in the dogs owner by rewarding desired behavior, rather than "punishing" undesired behaviors.
