1. HOW TO CHOOSE THE SIZE? Size S, which is suit for small puppies and dogs (waist size 9" to 15"). Size M, which is suit for medium dogs (waist size 14" to 20"). Size L, which is suit for larger dogs (waist size 19" to 27"). Please choose the size after measuring your dog's waist to ensure a good fit. 2. WHY 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. 3. WHEN 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 take your kids out. 4. WHAT DOES THE DOG DIAPER MADE OF? Cover Outer is 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. 5. 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. It is economic and environmental, when you reuse the cloth dog diapers.