DOGGIE DESIGN Dog Tuxedo w/Formal Tails- Black, Medium (Chest 16-19") SIZE MEDIUM (Chest 16"-19"). IMPORTANT: Measure the CHEST only, just behind the front legs. If your dog is on the borderline between sizes, always GO DOWN to the lower size, not up. The harness needs to fit snugly to work correctly. Formal tuxedo for small dogs! Set includes top hat and bow tie collar! Adjustable formal collars are perfect for weddings, parties and special occasions. Well tailored and fully lined