My cats are indoor/outdoor, like 95 percent of the NZ cat population, however I am of the changed opinion, if you can keep kitty indoors, then perservere and DO IT!! as long as you have a cool house in summer, and warm in winter, and lots of things to keep them occupied, then go for it, it make take time, but others have vouched that it can be done, so GOOD LUCK, and in no time you will have a lovely content indoor kitty.