Please see directions under images on how to measure your pet’s chest size. Sizing: XXS chest size: Up to 13” XS chest size: Up to 16” S chest size: Up to 19” M chest size: Up to 22” L chest size: Up to 25” XL chest size: Up to 28” XXL chest size: Up to 31” *all measurements are approximation and sizing may vary. For the most accurate sizing, please be sure to measure the chest size . Please be sure to measure your pet’s widest part of her/his chest as shown in the image. Our Products: All of our fabrics are hand selected, trendy, high quality, and soft comfortable fabrics.