Ensuring you have the correct size is vital. Always try the muzzle on your dog to ensure the right fit. The nylon muzzle should fit snugly, but allow you to place a finger between the muzzle and your dog's skin. If your dog is prone to biting, always ensure someone is there to help you stay safe while fitting the muzzle. Praise and reward your dog while wearing the muzzle to create positive associations and prevent your dog from starting to avoid it.