I am going to write a new series called "The Changeling Cat"
Except where in this one, the cat owner is actually a little crazy. They call the authorities every day claiming that someone broke into their apartment and switched out their cat. And they will also claim that the cat is moving things around the apartment while they are gone.
It will have an early twilight zone feel to it.
Perhaps I could write it like this:
One day the cat did go missing and the whole town was on the lookout for this cat, when one shows up and the cops convince the lady that it is indeed her cat. But she will claim, "Oh no! My cat never sat all cute like that!"
And then she will ask the cat, "Who are you?" "Where did you come from?"
And in this one her real cat will be found alive, living in a colony with other cats, just sniffing catnip and having a good ol time.