NOTICE: Please measure your dog's mouth and neck. Then check the second picture and choose suitable size before you purchase. LIGHTWEIGHT AND DURABLE:Made of high quality soft and tough silica gel, adjustable nylon strap, gives all-around protection, easy to use. BREATHABLE:The basket design is convenient for dogs to breathe freely, not overheat, you can also feed easily, dogs can drink water and breathe, easy to clean. MULTIPLE SIZES:6 sizes, meet the needs of a variety of breeds.The specific size of this model is: the mouth range is 34 cm, the length is 11 cm, and the neck strap is 30-50 cm. APPLICATION:Specially designed for more aggressive dogs.