So we've just moved house, and mogs is settling in nicely and more than ready to go outside. Problem is there's only large glass windows/doors at the back of the house. We thought a glazier could come and fit a flap to one of the windows but after ringing around, it seems we would have to replace an entire pane, and it would cost a small fortune. Could we wing it without a flap or will he drive us crazy yowling to come in at 3am? He's around 6 and always been a very outdoorsy type (unlike his people) so keeping him indoors isn't an option. Plus he is tracking bloody litter all over the house and I have a crawling baby who likes to sample it 