Size (measured flat) Length: 27cm, Width: 13cm *Please note that these measurements are approximate due to manual measuring. Size 3 I bought this intending to use it on a 3kg Dachshund, but I never actually used it. I carefully hand-washed it with pet-friendly detergent before listing it, but please refrain from purchasing if you are sensitive to items stored at home by a non-professional. m(_ _)m