The soft plush-lined onesie of your pooch's dreams, Why you'll love the Frosty Fleece Sweatsuit Cozy plush interior for extra warmth & comfort for your dog Trendy marled & printed exterior for an elevated style Snap button neck closure Ribbed cuffs for a comfortable & snug fit BACK LENGTH Measure from the base of your dogs neck (right below where their collar would sit) all the way to just above the top of their tail. CHEST GIRTH Measure around the largest part of your dogs chest, just behind their forelimbs. Size Back Length Chest Girth 10 10" Up To 20" 12 12" Up To 22" 14 14" Up To 26" 16 16" Up To 29" 18 18" Up To 31" 20 20" Up To 34" 22 22" Up To 36" 24 24" Up To 38"