Lillypet&reg; SET 2pc Washable Cotton Dog Diaper Pet Female Sanitary Pant Clothes Apparel Small Dog Diaper For SMALL Breeds. PLEASE measure you pet! These diapers are reusable. They DO NOT INCLUDE the ABSORBENT pads. Women's feminine napkin works perfectly and attach with the adhesive strip. You decide how thick or pad you need for your dog. Please understand that there is no standard sizing system for pet clothing. Please measure your pet and compare to the chart provided as each brand and style of pet clothing has its own sizing system. Small: Size S - waist 9.44" - 15.74" NOTE: When measured don't be too tight,small dogs appropriate to relax 0.5 ", large dogs relax 0.8" -1.2"