Was your kitty a Outdoors/indoor cat, or just indoors? Because most cats who've never been outside by themselves in their life don't usually run away. But there are exceptions. My cat who I rescued from my neighborhood is more likely to try to leave my house because she was used to the outside. My much older cat has only been outside with a kitty harness on, and he isn't interested in leaving us. He is 16 by the way. How old was Maxy?