How do I know which size would fit my pet dog?   Please use a measuring tape to measure around the breast first. The rest of sizes such as neck girth and the body length will be fit. Please measure the breast girth of your dog and match it against the measurement chart which is shown on the detail information of each item as below.   PUPPIA STANDARD MEASURMENT SIZE Neck girth Breast girth Body length XS 13~18cm 22~27cm 13~17cm S 18~23cm 28~33cm 17~23cm M 23~27cm 34~40cm 23~28cm L 27~31cm 40~45cm 28~35cm XL 31~35cm 46~50cm 35~41cm XXL 35~39cm 51~59cm 41~48cm 3L 39~42cm 60~69cm 48~58cm 4L 42~48cm 81~87cm 58~63cm 5L 47~50cm 88~94cm 64~70cm If you are still not sure of what size to buy, please do not hesitate to e-mail us, or call us at +82-2-493-6178. We will be able to give suggestions or answer any questions.   ☞ More