Cat - is graceful and freedom-loving animals. But very often they become reclusive, sitting in the four walls and sad glances out of the window. Many residents of high-rise and high-rise buildings are wondering: “How to help your pet to freely leave the apartment, and then just as easy to go back?” When you live on the first floor, the problem seems to be no, but if at the entrance door with a combination lock - the walk becomes more complicated. Some owners have solved this problem originally - contrived for their pets special bridges or ladders.