This dog diaper is our highest quality pet diaper and 100% WATERPROOF Oxford fabric. The diaper not only features an elastic adjustable hook and loop fastening system waistband for comfortable but also has a cinch-lock tail anchoring system, this prevents the diaper from leaking around the dogs? tail and helps gently secures the diaper on the dog. A thick layer of absorbent protection is sewn in and will keep your pet and your floors ultra-dry! This diaper is machine washable, reusable and hang to dry (do not use bleach). For your pets? health and safety, we do not recommend using the diaper for repeat urinations and ask that you please change your pet as needed. THERE IS NO STANDARD SIZING SYSTEM FOR PET CLOTHING and/or ACCESSORIES. Pet clothing is based on measurements and not weight or breed. Before placing an order, please measure your pets? waist and compare those measurements to the sizing chart provided in the description and also in the photos. Each and every different brand and style of pet clothing has its own sizing system. One brand/style size ?Medium? could very well be another brand/style size ?X-Large?. Each item has its own unique sizing chart and no two items have the same chart.