Petsfit Weatherproof Outdoor Cat Shelter/House/Condo with Stair 27.5" Lx17.5 Wx20 H Weatherproof large cat/small dog house for outdoor use Inner dimension of the house:27.5"Lx17.5"Wx20"H. COME WITH STAIR A plastic flap on the back escape door Bottom floor can be removed for easier cleaning,top roof cannot be opened WITH FEET-keep rain from getting in the house