Adopting high quality cotton fabric which is comfortable and breathable, will not hurt dog’s skin. Classic and casual style make dogs more attractive. To a certain extent help to prevent dogs from mosquito’s biting or insect hiding into dog’s hair. Soft and breathable cotton fabric bring dog comfortable wearing experience, however, cotton material will shrink a little after washed, if your measurements approach the upper end of the range given for size chart, larger sizes maybe more suitable for your dog. Besides, it’s better to wash shirts with cold water which may decrease shrink. Humanized design: there have 5 sizes available which can satisfied different size of dogs, like Chihuahua, Yorkie, French bulldog, Boston terrier, Corgi, Pomeranian, Fox Terrier, Schnauzer, shih tzu, Golden Retriever, Labrador and so on. Note: may your baby usually wear size small clothes but it doesn’t mean all small size clothes would suitable for them, different design, fabric and other factors may bring dimensions of different clothes not to be same. Therefore, please kindly double confirm the sizes before order this product in order to buy most suitable one for your dog.