Dogs in Play Multi-Function LED Lighted Dog Harness - XL 26" - 34" long, 1" wide XL harness: 26" - 34" long, 1" wide Correct Harness Size: The sizes listed above indicate the maximum size with the buckle fastened. Measure the entire circumference of your pet's midsection (all the way around) before ordering. You may wish to add 1" - 2" to the measurement for your dog's comfort. Don't forget to buy a matching leash!