ours does litter trays- he's super-fastidious, won't go in the garden, he has 2 trays and he wees in one and poos in the other. If he's pooed twice- once at each end- and we haven't cleaned it yet, he gets quite distressed and stands and meows at it
But we want him to use covered trays now there is a kid on the way- we just don't want a crawler being able to get at cat litter! But he just doesn't seem to get the covered one- we got one which has a kind of cat flap at the front, and one where he climbs in the top. He explores them, but doesn't use them