Giveme5 Fashion Pet Dog Puppy Cat Classic Quote T-shirt Doggy Summer Clothes Cotton Shirts Tee shirts Dogs Costumes Cat Tank Top Vest XS:Back length--18cm/7.09";Bust--30cm/11.81" ;Neck--21cm/8.27" S: Back length--23cm/9.06";Bust--36cm/14.17";Neck--25cm/9.84" M: Back length--29cm/11.42" ;Bust--42cm/16.54" ;Neck--30cm/11.81" L: Back length--35cm/13.78";Bust-- 45cm/17.72" ;Neck--34cm/13.39" Please pay attention that this is an Asian Size usually it will be 1 or 2 size smaller than US size, please according to the size chart below