UrbanPup Active Mesh Neon Green Harness (X-Small - Dog Chest Circumference: 10" / 25cm) Breathable material for maximum air circulation Designed to provide the ultimate in comfort Secure clip in easy on easy off action Sizes Range From X-Small to X-Large (Small / Medium Sized Breeds) X-Small (Chest Circumference: 10" / 25cm). Breed Guide: Small Chihuahua, Small Breed Puppy