Super Buckle: High quality POM buckle with 4 points lock system. Fully adjustable: Neck and girth adjustments for perfect fit and security. Double D-rings: Front and waist stainless steel. D-rings to walk your dog from the position that suits best. Extra Small Size and Width: 1 cm, Neck: 20 - 34 cm (7.9 - 13.4 in), Girth: 23 - 38 cm (9 - 14.9 in). Recommended Breed Types: Chihuahua, Yorkshire, Greyhound, Pomeranian, German Spitz, etc. Small Size and Width: 1.5 cm, Neck: 24 - 38 cm (9.4 - 15 in), Girth: 32 - 53 cm (12.6 - 20.8 in). Recommended Breed Types: Poodle, Shih Tzu, Bichon Frise, Boston Terrier, Maltese, Japanese Spitz, etc. Medium Size and Width: 2 cm, Neck: 31 - 50 cm (12.2 - 19.6 in), Girth: 42 - 69 cm (16.5 - 27.1 in). Recommended Breed Types: Beagle, Pug, Dobermann, Shiba Inu, Corgi, Basset Hound, French Bulldog, etc. Large Size and Width: 2.5 cm, Neck: 40 - 67 cm (15.7 - 26.3 in), Girth: 62 - 107 cm (24.4 - 42.1 in). Recommended Breed Types: Golden Retriever, Dalmatian, German Shepherd, Labrador Retriever, Chow Chow, English Bulldog, Siberian Husky, etc.