I lived in a condo with my three yorkies and all we had was a balcony for them. They stayed in an x-pen when I went to work and I took them for walks and out on the balacony when I was home. It worked and now that I own my own home they are starting to learn to explore a little more. I noticed they make sure I am in eye sight, they'll go out a few feet and run back and touch my foot then do that over and over. I think eventually they will get used to it,