We have an eight month old kitten, and an older one. Kitten loves going outside and will come in the cat flap... but he wont go out of it! He sits next to it and watches our other cat go out. I want him to go out of it, I'm not always home to let him out, and I want him to toilet outside so I can get rid of the litter tray. He does toilet outside when he is out there. Should I put the litter tray outside and see if that tempts him out of the cat flap?? I do shove him through it sometimes but he doesn't use it himself 🤔