NACOCO Pet Dog Clothes Warm Adidog Panda Hoodies Sweatshirt Hoodie Jacket Size Small: Back 7.9 Chest 12.6 Neck 9.1 inches Size Medium: Back 9.8 Chest 14.6 Neck 10.2 inches Size Large: Back 11.8 Chest 16.5 Neck 11.4 inches Size X-Large: Back 13.8 Chest 18.5 Neck 12.6 inches Size-XX-LargeBack 15.7 Chest 20.5 Neck 13.8 inches