NACOCO Dog Clothes Puppy Coat Vest Pet Ski Vest Dogs Cotton Vest Pet Ski Jacket Winter Fall Outfit Waterproof for Small Dog Please pay attention to measure dog chest circumference Size Small: Back length 8.3 inches Chest length 14.2 inches Neck 11 inches Size Medium: Back length 9.8 inches Chest length 16.5 inches Neck 12.6 inches Size Large: Back length 11.8 inches Chest length 18.1 inches Neck 15 inches Size X-Large: Back length 13.8 inches Chest length 19.7 inches Neck 16.5 inches