I have a couple for the IGs, Crystal and Jewel wear them. They look like completely normal collars, except they have an extra metal loop. They make cute ones, I have a black one with paw prints and a blue and green one with diamonds. They are not a breed-specific item, any dog can wear them. Our smooth fox terrier had to wear one to compete in 4-H dogs shows with my son. They are effective at keeping a dog from slipping a collar, but not as harsh as a choke chain.