Thank you very much for visiting us from among many options. This is a backpack-style harness with a leash! It's convenient because you can store treats, poop bags, etc.♪ Reference S size: 12x14cm Suitable for dogs under 4kg: Chihuahua, Toy Poodle (2-4 months old), etc. M size: 14x18cm Dogs weighing 4-7kg: Toy Poodle (4-6 months old), Maltese, Cocker Spaniel (3-4 months old), West Highlander, etc. L size: 16x20cm Suitable for dogs weighing 7-10kg: Cocker Spaniel (5-6 months old), Pug, Miniature Schnauzer, Pomeranian, etc. [About Size] Please refer to the image. [About Color] The pattern and color intensity may vary depending on the production lot. The color of the actual product may differ from the image due to lighting conditions during photography.