Large. 1″ Width. Fits dogs similar in size to a standard German shepherd Strap a: adjusts 22 – 38″; strap b: adjusts 16 – 26″ Harnesses are adjustable around both the neck (a) and Chest (b) Kwik klip buckles allow Harness to be fitted and removed quickly and adjusted to grow with your pet Handcrafted in the United States