Alfie Pet by Petoga Couture - McDonald Costume Size Small best fits neck girth: 8.5", breast girth: 12", and body length: 9.5". Sizing for each dog is unique. 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. This McDonald Costume is just a perfect gift for your little one! Easy to put on and comfortable to your little baby. One of our favorite picks for the season. You will not be disappointed with the details. Great for special occasion and weekend party. Product comes with Alfie Signature zip-lock storage bag for convenience and protection for years to come.