Introducing our Bossy Martingale collar, expertly designed with your hound's comfort and safety in mind. Hand Crafted with two loops, the larger loop easily slips onto your hound's neck while the lead is securely attached to the smaller loop. When your hound pulls, the tension on the lead tightens the small loop, ensuring a snug fit without discomfort. SIZE GUIDE - measure your dog using a fabric tape measure and compare with the measurement guide below.MEDIUM - 1.5 inch width will fit hound with 27-37cm neck circumference (Recommended for Whippet, Saluki, Afghan Hound) LARGE - 1.5 inch width will fit hound with 35-48cm neck circumference (Recommended for Greyhound, Borzoi, Silken Windhound)