The half-choke collar is perfect for active dogs that are allowed to run free during training. The half-choke collar is also well suited to daily walks when you need to be sure of your ability to control the dog. The half-choke collar should be just the right size for the dog. The collar is the right size when it fits over the dog’s head, but is firmly placed around the dog’s neck when pulling on the leash. It is made of highly durable materials that include 3M reflectors. The collar is also machine washable.