NOTE: Please measure your dog's chest and back length before order it (It is better to choose the sweater size based on the back and chest girth but not Weight) We also suggest you to choose a larger size if you worry about it will too small for your pets. If you can not sure choose which size, please go with larger size. Material: 100% polyester Size Chart: S (Neck:23cm/9.05" Chest:32cm/12.59" Back:20cm/9.45" Recommend weight Within 4.4 lb) M (Neck:26cm/10.23" Chest:37cm/13.78" Back:25cm/11.02"Recommend weight Within 6.6 lb) L (Neck: 29cm/11.41" Chest:42cm/16.53" Back:30cm/12.60"Recommend weight Within 9.3lb) XL (Neck:32cm/12.59" Chest:47cm/18.50" Back:35cm/14.17"Recommend weight Within 13.2 lb) 2XL (Neck:35cm/13.78" Chest:52cm/20.47" Back:40cm/15.75"Recommend weight Within 19.8 lb)