... room for some litter around the edges so that your cat can use it but also starts to learn ... So, if you have a large cat that weighs 20-25lbs (10kg) the Cat Toilet Training System needs to cope ... you're thinking - it's just a gimmick, cats hate water, they'll fall in. Oh ye of little ... advantages, I know for a fact that most pet welfare agencies recommend that your cat be kept indoors, not outdoors, ( ...