Currently have an indoor one with a lid and door and use good clumping litter but the smell still permeates the house (not helped by the fact that I'm pregnant and my sense of smell has gone mental). I want to try an outdoor one but DP (who, to be fair, would be the one cleaning it) is convinced that other cats will poo there and foxes will spray/mark the outside (we do have both other cats and foxes in the garden). Does anyone here have an outdoor litter tray and is this a problem? Any other tips for using one or which brand to buy? Thanks!