I really have spent one too many fearful times trying to find him after he has slipped of lead. Front-clip harness – against a regular harness where the clip is on the again, the clip for these harnesses is located on the front of the dog’s chest. When a dog in one of these harnesses pulls or tries to get too far ahead, they are going to be turned back round. This is helpful when you’re training a canine to walk next to you rather than pulling ahead of you. When the leash is pulled, the collar tightens around the dog’s neck.