Our Personalized Martingale No-Pull Collar is designed to tighten up just enough to get your dog's attention, without ever causing choking. A martingale collar provides more control over your dog, thanks to a two-loop design—one that goes around your dog's neck and a smaller loop for leash attachment. When your dog tries to pull, the small loop pulls taut and tightens up the larger loop, controlling your dog and preventing him from escaping. Originally designed for sight hounds whose narrow heads caused them to easily slip out of standard buckle collars. This safe and effective collar is favored by professional dog handlers and trainers. Top-quality nylon webbing and a sturdy steel D-ring ensure durability, while your dog's name and your phone number embroidered onto the collar makes sure your dog always finds his way home. For correct size, measure at the top of the neck, directly behind the ears. Personalize small with up to 15 letters and/or numbers, including spaces; medium and large with up to 24 letters and/or numbers, including spaces. Personalization is available on collars only. Choose contrasting thread color: gold, pink, red, purple, green, blue, orange, white, black. All personalization in uppercase letters.