I have 3 cats but so far only one ( the little guy ) has figured out how to get up to the top where I have the house and the hammock . He'll lay on the hammock for  a while then crawl in to the house and sleep for a bit . For me it was not an easy job to install due to my old home which have 2"x2" studs for the interior walls . I took other reviewers suggestions and used my own heavy duty screws which works okay . looks nice on the wall too . Hopefully my other 2 will someday check it out too.