Cute harness and leash set. M size The buckle that comes behind the neck allows for considerable size adjustment. I am currently using the same set. I bought this as a spare because it's cute, but it still seems usable even after 5 years, so I've decided to list the new one. For reference, my dogs are 4kg to 5.5kg and it fits them perfectly. The last photo is a reference photo and shows a different pattern.