I don't use shock. I'm fine with others using it (properly), but I don't use shock. What do y'all think of vibration collars? I would use it not as punishment, but as a way to call my dog when she's too far away to hear, or, since she can have a one track mind, I thought it might get her attention in a pain and punishment free way when she's distracted. Do vibration collars classify as aversive? DO the dogs find them even somewhat unpleasant? Thanks.