Size XS: chest is 33-43cm/13-17in
Size S: chest is 43-56cm/17-22in
Size M: chest is 56-69cm/22-27in
Size L : chest is 69-81cm/27-32in
Size XL: chest is 79-96cm/31-37in
Note:
1) if there is discrepancy between the neck and
the chest ,follow the chest size
2) if your dog is between sizes,please size up,
choose larger size
3) please add 3-4cm to the chest girth of your
dog, for example,if the chest girth of your dog
is 66cm,you need to choose 69-70cm chest, L size