Cats naturally dump on surfaces they can scratch and excavate, and learn from their mothers not just how to use a litter tray but also their excavation techniques in the litter! Mechanical engineer mothers produce mechanical engineers kittens, individuals that energetically dig and cover their pee and poop. Sometimes, and fortunately it’s rare, kittens don’t learn from their mothers and don’t arrive already litter trained. For inexplicable reasons this is more likely to happen with Persian kittens than with any other breed or with moggies. Using a training pen for a few weeks almost always teaches the untrained kitten to use cat litter, rather than your carpets as a toilet.