Cetacea PTC38CQR4 3/8" Adjustable Chain Martingale Collar Recommended by vets and dog trainers when a correction collar is needed on your dog, vets and dog trainers recommend this type of dog collar Designed to imitate the type of collars horses wear, which provides a limited choke collar dogs Quick release buckle practical quick release buckle so that the collar doesn't have to be adjusted to put on or remove the collar