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.

Size Details:
This dog clothes is for small toy dogs or cat under 20 pounds / 10KG
Size XS: Neck: 24cm/9.5inch Back: 23cm/9.0inch Chest: 28cm/11inch;
Size S: Neck: 28cm/11inch Back: 27cm/10.6inch Chest: 36cm/14.2inch;
Size M: Neck: 35cm/13.8inch Back: 32cm/12.6inch Chest: 42cm/16.5inch;
Size L: Neck: 38cm/15inch Back: 38cm/15inch Chest: 45cm/17.7inch;
Size XL: Neck: 44cm/17.3inch Back: 43cm/17inch Chest: 49cm/19.3inch;

Breed Recommend: (for reference only):
Size XXS,XS: teacup, kitten,puppy,chihuahua ( weight under 2lbs/1kg)
Size S,M,L: cat,puppy,chihuahua, pomeranian, maltese, yorkshire terrier (weight 3-10lbs/1.5-4.5kg)
Size XL.XXL: toy poodle,papillon,shih tzu,mini doberman,bichon frise,pekingese,jack russell terrier,miniature schnauzer,pug(weight 11-20lbs/5-9kg)
The recommend weight is just for reference, please kindly take a measurement of your dog before buy,thanks.