Our harnesses features 5 different adjustment straps, a comfy easy-to-clean design, and more than one way to attach your leash. Sizing: Medium- Neck 14"-18" Chest/Girth 19"-24" Large- Neck 18"-26" Chest/Girth 24"-34" X-Large- Neck 24"-38" Chest/Girth 29"-43" Product Speculations: Lifetime guarantee, break it, we repair...