I am trying to identify a science fiction short story I read many years ago, probably in the late 60s or early 70s. In it, a man living a typical suburban type of life goes outside to get his morning newspaper and comes back inside to discover that some kind of creature or machine has been wrapped in the newspaper. The smallish creature is described as white and rat like, and aggressive, as it immediately attacks the man. He fights it in his bathroom/bathtub, and although it's very durable he's successful in killing it. He goes outside afterward to see all of his neighbors being attacked by the same type of creature. This was probably in a short story collection book and not a magazine.