All three of mine are indoor only. When I lived out in the country, on a private road with very little traffic, I still lost two cats to cars. And before that, I had one cat disappear - I never found her or even what happened to her. It is too heartbreaking for me.

My cats don't mind not going outdoors, I have birdfeeders near the windows, and lots of fun indoor cat stuff - and I play with them a lot. I don't have to worry about cars, or fleas, or them eating dead things. And I don't have to worry about where they are or what they are doing - I know they're safe inside.