Happy Puppy Designer Dog Accessory - Red Sailor Harness with Leash Set - Color: Red, Size: XS For sizing chart, click on the other images link above. Sizing for each dog is unique. Similar to our clothing and accessory, medium size from one designer is not the same for another. For example our 9-pound yorkie model usually fits either one of three sizes (i.e. XS, S, M) depending on the designer. We highly recommend you measure your pet precisely with a flexible tape measure to ensure the best fit. Contact us if you have question. We are happy to help. Harnesses are comfortable alternative to collars for small pets as they evenly distribute restraint across the chest. Our harnesses are designed to be gentle and put less stress on the pet when pulling on the leash. Made of soft, lightweight and breathable material. Machine washable for easy cleaning. Comes complete with a matching leash. Feature a sturdy D-ring for easy leash attachment. Perfect for everyday walk and weekend party, or just making your pet look its best.