This is a fantastic Scooby-Doo Dog Costume! Your dog will be ready to join Velma, Shaggy, Fred and Daphne for the party! This Scooby-Doo Dog Costume is an officially licensed Scooby-Doo costume. To get the best fit for your dog costume, follow the guidelines below. MEASUREMENTS IN INCHES* General dog costume measurements are as follows: XS Neck 12-13, Chest Front 5-7, Neck to Hem 10, Chest/ Belly 16-17; S Neck 14-16, Chest Front 8-10, Neck to Hem 15, Chest/Belly 20-23; M Neck 17-19, Chest Front 10-12 Shoulder to Hem 17, Chest/Belly 24-28; L Neck 20-2, Chest Front12-14, Shoulder to Hem 20, Chest/Belly 30-33; XL Neck 24-28, Chest Front 14-16, Neck to Hem 24, Chest/Belly 34-38. PLEASE NOTE: These are flat garment measurements not measurements of average dog who would normally wear this size.