Size----Neck-------------------Chest-------------------Body-------------------Weight

XS------15cm/5.9inches------31cm/12.2inches----- 20cm/7.9inches--------
S-------20cm/7.9inches------36cm/14.2inches----- 24cm/9.5inches-------- 3.3-5.5lb

M------24cm/9.5inches------42cm/16.5inches----- 28cm/11inches------ 5.5-8.8lb

L-------26cm/10.2inches------50cm/19.7inches----- 34cm/13.4inches------ 8.8-13.2lb

Please CHECK dimensions carefully before you decide which size to buy.

Size up if your pet's body length is longer than normal.