ALL collar styles listed in our store can be ordered in any of the 6 versions listed below (for cats & dogs). Measurements are listed in reference to neck size (in inches). We do not recommend basing your neck size estimate on weight alone. Please measure before ordering, if you are not absolutely sure.• KITTEN (6-10 inches)Fits kittens + smaller adult cats (and tiny miniature dog breeds) (approx. 4-10 lbs)• ADULT CAT (8-13 inches)Fits cats (approx. 8-18 lbs): Suitable for average-sized + slightly larger kitties• XL CAT (12-16 inches)Fits large cats (approx. 18+ lbs): Suitable for bigger or fluffier cats (please measure to be sure)• TINY DOG (6-10 inches) Includes D-ring (instead of round split ring used on cat collars). Fits most teacup & miniature dog breeds and small puppies (approx 2-4 lbs). Please measure to be sure.• MINI DOG (8-13 inches) Includes D-ring (instead of round split ring used on cat collars). Fits most small dog breeds (approx 4-10 lbs) including: Chihuahua, Mini Dachshund, Papillon, Maltese, Pomeranian, Mini / Toy Poodle, Shih Tzu, Mini Schnauzer, Yorkshire Terrier...(please measure to be sure).• SMALL DOG (12-16 inches)Includes D-ring (instead of round split ring used on cat collars). Fits XL cats and small / medium-sized dog breeds including: Beagle, Jack Russel Terrier, Boston Terrier, French Bulldog, Cocker Spaniel, Pug, Poodle...All of our collars are 1/2" wide, regardless of what length / neck size you select when ordering.