snout width: 25-30cm. Please refer to the picture for the correct size. Measure the circumference of the dog's mouth and neck. It is important to order the correct size. This large dog muzzle is made of thick metal: It is rust-resistant, durable and contains breathable leather for comfort and strength. The joints of the metal muzzles are fixed by rivets and are not easy to fall off: Dogs cannot remove it with their paws. It has adjustable straps that comfortably fit the size of the dog. This metal dog muzzle lets in a lot of air: which is essential for the comfort and health of your pet. It allows him to gasp and drink water, but prevents him from biting other dogs. Our metal dog muzzle offers maximum safety: maximum comfort and maximum protection. The installation is very easy.