All Sales Final. All muzzles do not fit perfectly. But, this one I've used for many types of dogs. This video, I am using the medium.
Keep in mind, I have about 40+ muzzle, all for different sized muzzles, none are perfeclty fitting. If you get stuck with a muzzle you'll never use and you are NOT a groomer, you can donate to your local dog rescue group, veterinarian, or groomer so it's not a full waste.