Cute Bee Floral Printed Pajama Pants Dog And Owner Matching OutfitsSize Neck Girth Chest Back Length Weight S 13. 4 15. 7 11. 8 5 10 lbs M 14. 6 17. 7 13 11 16 lbs L 15. 7 19. 7 14. 2 17 24 lbs XL 16. 9 21. 7 15. 4 25 32 lbs 2XL 18. 1 23. 6 16. 5 33 40 lbs 3XL 19. 3 25. 6 17. 7 41 48 lbs Size US Waist Hips XS 6 71~77 93~99 S 8 77~83 99~105 M 10 83~89 105~111 L 12 89~95 111~117 1X 14 95~101 117~123 2X 16 101~107 123~129 3X 18 107~113 129~135 4X 20 113~119 135~141 5X 22 119~125 141~147 6X 24 125~131 147~153