our cats were smelling out the house with the litter trey, so we put it outside with a cover on it and put them in it frequently thoughout the day. They soon got the jist of it!. Although we were a comedy sketch - one of us potsing the cats in turn through the cat flap, and the other one of us outside, ready to recieve the posted cat and chuck them into the litter tray!

Who ever said cats were dull??!!!