Our cat uses his litter tray fine... however, we'd like him to start going outside. He's 6 or 7 and has had a previous owner (although we have no idea what went on there), so presumably may have had access to a garden before.

We've had him for a month now.

Do we just remove his tray? I'm not sure that he wont just urinate in the corner of our house where the tray was, which he did once when we were cleaning it. Or do we move his tray outside? Our concern with that is that there is another cat which we've had some problems with entering our house through the cat flap. Also, given the current weather in England - wont the litter just get washed away?

Thanks

Matt