*Collars that are 3/4" Medium to 1" XXLarge are available in theMartingale design. The Martingale incorporates a small slip chain section so that the collar will tighten a few inches when your dog pulls, but without choking the dog. The tightening action makes them ideal as a gentler replacement for the correction (choker) chain. Excellent for obedience training or just for everyday wear.