How to measure the dog size? Chest: measure the thickest part of the chest, add 2~3CM will be better. (Usually behind the two legs) Length: Make sure your dog stands properly, not sitting or lying. Measure along the dog's backbone from the base of the neck to 5CM front the base of the tail. Neck: the girth of the neck, add 2~3CM will be better. Note: If your dog is a large chest, long hair, or at the high end of the size, you may order the next larger size to ensure a comfortable fit. If you not sure the size, pls feel free to contact us. Size Details: Size XS : Chest: 32cm/12.5", Neck: 23cm/9.0", Back:20cm/8.0"; for weight 3-4 pounds/1.5-2.0 KG. Size S : Chest: 37cm/14.5", Neck: 26cm/10", Back: 25cm/9.5" ; for weight 4-5 pounds/2.0-2.3 KG. Size M : Chest: 42cm/16.5", Neck: 29cm/11.5", Back:30cm/11.5" ; for weight 6-10 pounds/2.7-4.5 KG. Size L : Chest: 47cm/18.5", Neck: 32cm/12.5", Back:35cm/13.5"; for weight 11-15 pounds/5-6.8 KG. Size XL : Chest: 52cm/20.5", Neck: 35cm/13.5", Back:40cm/15.5"; for weight 16-20 pounds/7.3-9.1 KG. Breed recommend: (for reference only): Teddy or Poodle Adult dogs: sometime take M, L, XL Chihuahua Adult dogs: sometime take XS, S or M Pomeranian Adult dogs: sometime take S or M Miniature Schnauzers Adult dogs: sometime take L or XL The recommend weight is just for reference, please kindly take a measurement of your dog before buy,thanks.CONVENIENCE:The dress have a leash included, so you don’t need to wear another harness when you take your puppy out. OCCASIONS: Casual design for everyday wear, outdoor walking, traveling, photo taking, party costumes, holidays, festival occasion, etc. FASHION DESIGN: The dress is designed with floral pattern and lace neckline and hem, the big bow will make your dog looks more cute. The pull-over one piece, easy to put on and take off. MATERIAL: This dress is made of soft polyester, which is very soft and breathable, bring your sweet pet comfortable wearing experience. SIZE: Fits for small medium dogs under 20lbs.