... have three :small ,middle and large SmallCircumference of the Small is 7-1/2"For Minature Poodle, Bichon Frise, Minature ... Miniature Breeds with similar size snouts. This muzzle is BlueMediumCircumference of the Medium is 9-1/2"For Small Beagles, Fox Terrier ... and dogs with similar size snouts. This muzzle is OrangeLargeCircumference of the Large is 11"For Border Collie, Large Beagles, Springers, ...