Double-check the measurements just to be sure the size you chose will fit ok with your dog because sometimes the sizes vary with each breed. Measurements: XS: Back Length: 7.5" Chest:11.5-13" Neck: 7.5" XS+: Back Length: 8.5" Chest:12-14" Neck: 8.5” NEW! S: Back Length: 9.5" Chest:14-16" Neck: 9.5" M: Back Length: 13" Chest: 18-20" Neck: 10-12" L: Back Length: 14.5" Chest: 20-22" Neck: 12-14" XL: Back Length: 15" Chest: 22-24" Neck: 13-16" XXL: Back Length: 15.5" Chest: 23.5-26" Neck: 15-18" 3XL: Back Length: 18.5" Chest: 25-27" Neck: 18-19" 4XL: : Back Length: 20" Chest: 28-30" Neck: 20-21" Made in Mexico, 50% cotton/ 50% Polyester.