Petsfit Outdoor Cat Shelter Feral Cat,Cat House Cat Condo Green Easy assemble in a second. Inner dimension: 18"x17" NO feet - will need to put something underneath to lift up the house to prevent the water from getting in. Ideal shelter for outdoor cat with back escape door, so pet can't be trapped by predators. Will fit 1 cat under 15LBS. Good match with indoor and outdoor decoration. Panel walls are 12mm thick. Petsfit pet house is made of cedar,this kind of wood isanti-rot material,but it will split under impropertransportation. Houses are stury once set up.(HOWEVER, if you have a pet that chews and is destructive, thisis not the house for you.) The wood would last at least 3 years outdoor(tested). Dimensions will be marked as specific as possible on all our products,error may occurred,measuring error within 1 inch. We test the pet products with our own pet,normal size cat 12LBS.Estimation might be inaccurate. Please compare it&#039;s size with the kennel,carrier or house you have and choose the right size.