This Duke's Training Collar is designed for dogs of all sizes. It is a great tool for training your dog, as it provides gentle and effective control without causing discomfort or pain. The collar is made from high-quality stainless steel and is adjustable to fit your dog's neck size perfectly. It is a great choice for dogs who are prone to pulling or lunging, as it helps to redirect their attention and prevent them from engaging in unwanted behavior. Overall, this collar is a reliable and effective tool for training your dog.