Fancy Pants doggie diapers are just the answer to avoid accidents when pups are at an unfamiliar place, for training or for dogs in heat. Fancy Pants doggie diapers solve many problems to avoid accidents or for female dogs in heat. Not only do they offer protection, but they are cut and fashionable at the same time. Insert adhesive sanitary pad to absorb moisture. Diapers have velcro fasteners for flexible fit for all small breeds Diapers are made of cotton/polyester. Handwash cold water, lay flat to dry. Diaper Sizing A: Top line: Base of neck to base of tail. Hold tape measure at collar and measure to the base of the tail (preferably while dog is standing) B: Weight in pounds Size A: Top line B: Weight XS 8" 3-4 lbs. S 10" - 12" 5-7 lbs. M 14" 8-12 lbs.