Martha Stewart Pets Dog Vest Harness Polka Dots Martha Stewart Pets Polka Dot Harness Dress features an intricate design and vibrant trim. The harness distributes tension equally, making it safe and comfortable for your dog. Size: XS ideal for pets up to 12 pounds, 12.6" girth. Size: Small ideal for pets up to 20 pounds, 14" girth. Size: Medium ideal for pets up to 30 pounds, 16.6" girth.