Im a bit worried about other cats going in through it though !
Good luck - do you have a cat flapMy heart was in my mouth a few weeks ago when Homer went out for the first time. I fitted him with a loc8tor tracker for my own piece of mind:http://search.ebay.co.uk/search/search.dll?from=R40&_trksid=m37&satitle=loc8torIt was well worth the money I thought