Pet Dog Cat Vest Harness with Dog Leash Princess Black XXS(0): girth 11.5"; recommended for pets about 2-3 lbs XS(1): girth 13"; recommended for pets about 3-5 lbs S(2): girth 15"; recommended for pets about 5-8 lbs M(3): girth 17"; recommended for pets about 8-12 lbs L(4): girth 19"; recommended for pets about 12-15 lbs