EzyDog Checkmate Martingale-Style Training and Correction Dog Collar MARTINGALE-STYLE CORRECTION TRAINING COLLAR: Our martingale style collars are safer and more comfortable than choke collars for more control over your dog without the choking effect of a slip collar to reduce the risk of a dog pulling out of the collar and escaping. UNIQUE DESIGN RESPONDS WITH EACH TUG: Our unique cinching-design martingale collars tighten securely when your dog pulls or you apply a gentle tug. They feature quick-clip buckles for fast and easy on and off, and rust-proof D-ring for safety and security for daily walks. LOW-PROFILE NYLON COLLAR WITH REFLECTIVE STITCHING: The low-profile Checkmate collar is comfortable, lightweight, and rugged, and the highly reflective woven-in threads provide greater visibility and improved night safety. CHECKMATE COLLARS REQUIRE NO RESIZING: Unlike traditional Martingale collars, our Checkmate collars are easy to fit and do not require re-sizing for each fitting and our easy-to-use quick-clip buckles provide fast on and off. SELECT THE BEST SIZE: Based on your dog's NECK measurement. If you are close to the end of a size, bump up to the next size:Neck (Inches): SM 10-13, MD 13-18,LG 17-26, XL 22-33