"Pioneer Pet SmartCat Cat Climber is a multi-level climbing platform for felines. Why didn't someone think of this sooner? Designed to hang on any standard door in your home, the Cat Climber from SmartCat is the perfect choice for smaller homes or people who don't want to swap an end table for a traditional cat tree. Now your cat can scratch, play, sleep, and exercise safely on this patented product. The climber is easily moved from door to door because of its spring loaded bracket system. And with an adjustable height from 78 to 80 inches, it has no problem fitting on every standard door in your house. The natural sisal post is ideal for scratching. Made of durable wood, the climber will withstand years of use. ""I have three in my house, one for each cat,"" says designer Angela Moser. ""Our cats love it when we move them around the house, it's like a new adventure for them."""