HomeSize 3X Length Chest circumferenceXS(0-4lbs) 8 12S(5-10lbs) 9 13M(11-23lbs) 10 14L(24-45lbs) 11 15XL(46-70lbs) 15.5 18.52X(71-85lbs) 17 233X(86+lbs) 18 28Shirt for your DOG$25.00PriceOh Yeah, Baby!