I used to run a canicross dog store, but we closed due to Covid. I have new, unused harness in both red and black & yellow. Here is the website if you'd like more information: https://howlingdogalaska.com/products/second-skin-harness The below information and photos are provided by the company. How to measure for a proper harness fit: Measure the circumference of your dog’s neck from an inch or so above the shoulder blades to an inch or so above the breastbone and back, then compare that measurement to the sizing chart. If the neck size and suggested weight don’t match, go with the bigger harness to ensure the body strap won't sit too close to the dog's armpits. Sizes: XXS 16 inches (20 - 29 lbs.) XS 17 inches (30 - 39 lbs.) •S 18 inches (40 - 49 lbs.) •M 19 inches (50 - 59 lbs.) •L 20 inches (60 - 69 lbs.) •XL 21 inches (70 - 79 lbs.) •XXL 22 inches (80 - 89 lbs.)