Please, people, DO NOT put collars on these little furbabies. They will hurt their tracheas (windpipes). Use harnesses only. I know one little furbaby for sure, that they had a collar on her when she was young, and she now has trachea problems. You have to be very careful when you pull on their harnesses, too. Take them to training sessions and they will teach you how to train them so you don't have to yank on their leashes. Just a few words of precaution.