This is a selection of pre made muzzles. The muzzles are adjustable in the forehead, sides, and neck measurements. Before purchasing please make sure that your pups fits the given measurements. If you have questions please don't hesitate to reach out. Because these muzzles are made out of biothane, they ARE NOT bite proof, so please do not purchase this style of muzzle if your dog has bitten or believe they will be a bite risk.