Yes, it is. Mrs. Liberty said we could keep them as "outdoor cats," but I don't like that notion, even a little bit. We live in the burbs.
I'm a country boy, so we always had indoor/outdoor cats. Now that I'm no longer in the country and my buddies have indoor cats, it was something new for me when I care for them. Litter boxes?!? :wtf!:
But I have a friend who's lost several cats in the burbs, so I can see why people keep them in.