The best cat door for window is also a good option to keep your cat safe. The best cat door for window is fixed to your regular window glass. The Cat can squeeze itself out of the door and return. Once the cat returns, you can close the door from inside and feel very safe about your cat. Read more: - https://catterrace.blogspot.com/2021/10/a-cat-door-window-that-keeps-your-cat.html