Did you always have to train pets for litter box?

I have two cats. One has always been an inside-only cat and used the litter box without fail for 14 years. The only snag occurred when we introduced a new cat into the house and my girl was high anxiety over it. Then she decided to go in a place that was more of a comfort zone (she didn't have to go near the other cat.) We ended up placing a new litter box on that spot and she, as well as the other cat, now use both litter boxes (old place and new place).

The newer cat in my home used to be an inside-outside cat until she moved here and is now inside-only. She managed to use the littler box appropriately at her old home and we had no trouble at all getting her to use the litter box here. She has a silly tendency to try to cover her business with more than just the litter (the rug the pan sits on, the scoop and brush at the pans edge), but other than that she's spot on.