Large size:Fits for dog's front snot girth from 9" to 10" and back snot girth from 11.5"-13",and suit for dog's weight from 50LB to 80LB,and please refer to size chart,please contact us if you don't know which size should to choose,we will respond asap. Adjustable straps:The snout of muzzle comes with 2 adjustable length strap,there are three eyelets in the straps,you can choose the most suitable eyelet according to your dog's size,the dog muzzle also comes with a longer straps which weared on back side of head,the longer strap has five eyelets. Material:Made of soft leather,the leather is soft that don't make your dog feel uncomfortable,the muzzle also is equipped with breathable holes to prevent dogs from feeling stuffy and hot. Function:it can prevent dogs bitting other dogs or people when you go out for a dog walk,the muzzle design also can prevent your dogs from eating dirty things on the ground,also can allow your dogs visit vet. Service:you can send back to warehouse and request a replacement if you don't satisfy with the item.please contact us if you don't know how to choose size and other problems of the muzzle. AiliStar Leather Pet Muzzle for Dog Soft PU Leather Dog Muzzles Prevent for Biting Barking Chewing Brown Large