Delicol Cute Superman Pet Costume Superhero Dog Cat NOTE:we recommend one size up as this costume appears to be smaller than normal size. XS: 7 - 8.5 inches Neck Girth and 8 inches Shoulder Height M: 10 - 12 inches Neck Girth and 11 inches Shoulder Height L: 11.5 - 13.75 inches Neck Girth and 12.5 inches Shoulder Height XL: 23.5-26 inches Neck Girth and 18-20 inches Shoulder Height S: 8.5 - 10.25 inches Neck Girth and 8.5 inches Shoulder Height