NACOCO(TM Pet Dog Clothes Pet Clothing Dog Vest I Love My Parents Vest - 4 Color S: Back 8.3 Chest 13.4 Neck 8.7 inches XL: Back 13.4Chest 17.35 Neck 11.8 inches M: Back 9.4 Chest 14.6 Neck 10.2 inches XXL: Back 15.7 Chest 19.7 Neck 13.0 inches L: Back 11.8 Chest 16.1 Neck 11 inches