SET - 4pcs Lillypet TM Dog Health Pant Diaper Puppy Sanitary Underwear Dog Health Pant Diaper Sanitary Underwear Puppy Diaper for Big Dog Pants Wrap Band Nursing Reusable Washable The diapers include 4 pcs dog diapers shipped to you will be a RANDOM assortment of colors in the size you have select 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 measure your pet and compare to the chart provided as each brand and style of pet clothing has its own sizing system. One brand size M can very well be another brand size XL! Each listing has its own unique chart and no two listing charts are the same. Size S - waist 9.4" - 11", Size M - waist 11" - 13", Size M - waist 13" - 16" NOTE: When measured don't be too tight,small dogs appropriate to relax 0.5 ", large dogs relax 0.8" -1.3"