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 insert a finger between the muzzle and your dog's skin. If your dog is prone to biting, always ensure someone is there to assist you to stay safe when fitting the muzzle. Thank and reward your dog while wearing the muzzle to create positive impressions and prevent avoidance.