Cats will be unhappy if they sleep outside the door, because cats are very clingy and dependent animals, and they like to be around their owners. If cats are locked outside the door, they will guard the door, yell and scratch at the door. The cats will also stay outside the door because they are worried about their owners. If the owner doesn't want the cat to come into the house, he or she should be determined to ignore the cat, and the cat will gradually get used to it.

Tips:

Cats are very timid and easily insecure. Owners should interact with cats more and prepare some cat toys for them to play with to prevent Cats become depressed.