Leather Martingale Dog Collar from Bold Lead Designs Perfect for training or everyday walks: Use the Leather Martgingale collar as a gentler alternative to a choke, slip, or prong collar. The collar not over-tighten like a choke collar can and some dogs will stop pulling as a response to the sounds of the chain and the slight tightening of the collar. We recommend rewarding your dog for walking nicely on the leash with treats and making sure to stop walking when your dog pulls. Great for sight hounds and dogs who can slip out of regular collars: Since the collar tightens a couple of inches when leash pressure is applied, when the collar is properly adjusted, your dog wont be able to back out of the collar, yet wont be choked. Easy to use and adjustable: Adjust the collar to fit your dog as desired with our special Conway Buckle. Theres plenty of adjustment! Easy to put on and take off with a durable clip: No need to slide the Leather Martingale over your dogs head, just snap the clip to the chain ring. The snap is very secure and will not come undone accidentally. Long lasting!: Theres no fussy decoration to fade or wear out. Go ahead, let your dog go swimming and roll in the mud! The high-quality, natural leather will outlast any fabric or synthetic material. A little leather conditioner after a swim, bath, or jaunt in the rain will ensure your collar will last for many years. Sizing: Measure snugly around the top of the dogs neck, close to your dog's head. Small: 13-15", 5/8" wide, (33-38 cm); Medium: 16-20", 5/8" wide (40-50 cm); Large: 20-24", 3/4" wide (50-61 cm); Extra Large: 25-30", 3/4" wide (63-76 cm).