【⚠️ Measure your puppy's Chest Girth/Bust size Before buying, Choose Correct size Jumpsuit according to Our "Size Chart"⚠️】: Please First measure your puppy's Chest Girth/Bust size. Only know dog's Chest Girth/Bust size, you can choose the correct Jumpsuit for him/her according to Our "Size Chart" in the attachment. 1), Take each measurement slightly loosely. 2), If you're between two sizes on the "Size Chart", go with the larger size. 【⚠️XS Size: Dog's Chest-Girth less than 13.5-inch, Back-Length less than 10-inch, Weight less than 5.5 LBs⚠️】: XXS, XS, S, M, L, XL, The sizes are suitable for Small / Little / Baby puppy dogs, for the dog’s weight from 1.0~21.0 Lbs. Such as Chihuahua, Pug, Corgi, Papillon, Poodle, Bomei, Schnauzer, Bichon, Boston Terrier, Deer dog, Teddy Dog, American Foxhound etc. 【⚠️OUR "SIZE CHART"⚠️】: Your puppy usually wears M size clothes, it does NOT mean that all M sizes are suitable for him / her! The size standards may not be the same for different manufacturers. To choose the correct size clothes according to Our "Size Chart" in the attachment.