Since I work in the animal welfare industry I tend to notice how the community cares for their animals. I am always really concerned when I see people who have chains or collars around the necks of little puppies that are jumping around and running…and choking. My puppies always used harnesses so their necks and trachea would be protected. It seems so inhumane to put a chain or collar around such a tiny little neck. In case anyone would like a recommendation on a good product I have used, visit http://www.cetaceacorp.com/s-step-in-pet-dog-harness.html These are great harnesses that are “step in”, so your dog gets guided by the chest; not the neck. My dogs even bring their legs up to step in themselves, they are so used to the routine. It’s such a better alternative to harming a puppy or dog’s neck and tissue.