I'm Not A Cat. A Portion of All RAYGUN Sales Raise Money For Organizations That We Support. White Screen Print on a Black Dog Shirt (100% Combed Ringspun Cotton). Sizing from what we have experienced with our own dogs: XS = roughly 0-4lbs, S = 5-10lbs, M = 10-15lbs, L = 15-24lbs, XL = 20-35lbs, XXL = 30-50lbs, XXXL = 51-80lbs. For breeds with larger chests, please purchase one size up from their weight range. Cut and sewn sweatshop free. Designed and printed by Union Labor at RAYGUN.