HOW TO CHOOSE THE SIZE? Size XS/S/M/L. XS: A: Newborn Puppies Weight(3.5-7.5 lbs), B: 5.25 inch, C: 6.5-9.5 inches S: A: 9-15 inch, B: 6 inch, C: 9.5-11 inches M: A: 14-20 inch, B: 7.25 inch, C: 11-12.5 inches L: A: 19-27 inch, B: 8.5 inch, C: 12.5-15.5 inches How to ensure a fit size: A: Measure the circumference around dog's waist. B: Measure the length from the top of tail along back to waistline. C: Measure dog from the bottom of base of tail underneath to waistline. WHEN THE FEMALE DOGS NEED THE DIAPERS? When your cute dogs are untrained or unwell or have digestive issues, females in heat, and dogs that suffer from excitement urination or incontinence. WHY SHOULD WE CHOOSE FEMALE DOG DIAPER? Waterproof outer layer can keep off leaks and damage to your rugs, carpets, chairs and sofa at home, and also protect your car seat when you want to your kids out. WHAT DOES THE DOG DIPAER MADE OF? Made of environmental TPU, which is colorful printed and waterproof. Middle is 2-layer microfiber pad, which is absorbent and comfortable. Inner is polyester mesh, which can keep the diaper breathable and dry. HOW TO WASH THE DOG DIAPER? The dog diapers are hand and machine washable and quick air drying or low temperature laundry drying. So it can be prolonged use, because of the adjustable design and reusable feature. It is economic and environmental, when you reuse the cloth dog diapers.