Underdog Pet Costume Set - Large This Underdog costume for dogs includes a red shirt with letter "U" and blue cape. The underdog costume for dogs comes in pet sizes Small, Large, Medium, X-Small, X-Large. This adorable and humble superhero is an officially licensed Underdog pet costume. This underdog costume for dogs is an officially licensed Underdog costume set. Please note: This item's color may vary due to inherent manufacturing variations or your computer monitor's color settings. The item you receive will be identical or substantially similar to the item pictured in this listing.