Zack & Zoey® Polo Shirts for Dogs feature ribbed knit cuffs and two-button collar for a tailored yet sporty look. - Two button collar adds authentic detail Material: 100% CottonCare: Machine wash cold on a gentle cycle. Line dry.Measure:Back: Measure length of pet’s back from the base of the neck to the base of the tail. See below for estimating by breed.Neck: Measure the circumference of pet’s neck for a snug fit. No need to add inches as you would with a collar.Chest/Girth: Measure girth around the broadest part of the chest and add 2”.Note: If the dog has a stout build, select one size larger.Size:XXS:Lenght:8" Neck:8" Chest:13"XS:Lenght:10" Neck:9" Chest:15"S:Lenght:12" Neck:10" Chest:16"S/M:Lenght:14" Neck:12" Chest:19"M:Lengt:16" Neck:13" Chest:22"L:Lengt:20" Neck:17" Chest:28"XL) Lengt:24" Neck:22" Chest:34"