Size:Small This Batman Costume is just a perfect gift for your little one! You will not be disappointed with the details. Easy to put on and comfortable to your little baby. Great for special occasion and weekend party.Sizing:Please note that this listing is for SMALL size: 8.5 – 10.25 inches Neck Girth and 8.5 inches Shoulder Height (height of shoulder while standing). We recommend one size up for comfort if your dog’s measurement is the higher end of the range listed.Sizing for each dog is unique. Similar to our clothing and accessory, medium size from one designer is not the same for another. For example our 9-pound yorkie model usually fits either one of three sizes (i.e. XS, S, M) depending on the designer. We highly recommend you measure your pet precisely with a flexible tape measure to ensure the best fit. Contact us if you have question. We are happy to help. Please note that Alfie is a registered trademark and is exclusively distributed by Petoga Couture. Alfie trademark is protected by US Trademark Law. Use is strictly prohibited. Other seller offerings are counterfeits, they will not be identical to what is advertised here. Petoga Couture ship from US thru Amazon therefore all orders with them are eligible for FREE Super Saver Shipping and Prime Shipping Upgrade.