Mayerzon No Pull Dog Collar, Patented Martingale Collar for Small Medium Large Dogs with Buckle and Heavy Duty Nylon for Walking Training Hunting, Safe and Easy to Use(XL, Green)Hidden Dog No Pull Collar: Mayerzon martingale training collar for dogs no pull is NOT simply a cover for a chain collar, the links are built directly into the collar. This anti pull dog collar is camouflaged to look like a regular collar on the outside. There are many judgy people out there who feel spike collars are cruel, but they truly are a great training tool to use to correct unwanted behavior. Helps your dog be more relaxed and calm with it