Endorsed by leading veterinarians and trainers, these safe and effective PetSafe Headcollars stop pulling, lunging, and other unwanted behaviors. Works by applying gentle pressure to back of neck and muzzle when lead is pulled to direct dog in a more natural manner. Made of soft nylon Fits around the top of the neck and encircles the base of the muzzle Offers total head control without choking. Additional Details ------------------------------ Product description: Endorsed by leading veterinarians and trainers, these safe and effective PetSafe Headcollars stop pulling, lunging, and other unwanted behaviors. Works by applying gentle pressure to back of neck and muzzle when lead is pulled to direct dog in a more natural manner. Made of soft nylon Fits around the top of the neck and encircles the base of the muzzle Offers total head control without choking.