Nanny (short story)
Nanny is a science fiction short story by Philip K. Dick, first published in 1955 in Startling Stories and later in The Collected Stories of Philip K. Dick. It has since been republished several times, including in Beyond Lies the Wub in 1988.
The story takes place in the future where every family has a mechanical robot as a Nanny. A family of four has an older model Nanny, and every night, when the family goes to sleep, the nanny and the neighbor's nanny, which is a different model, meet in the back yard and fight. The Nanny gets damaged and must be repaired, which frustrates the family, as they're advised to upgrade to a newer model.
One day, the kids take the nanny to the park, where it gets assaulted and killed by another, much larger and more powerful Nanny. Their father, upset with this, goes and buys a brand new Nanny, the toughest model available. The kids are excited, but later, their new nanny kills the nanny of another family, whose father is forced to buy another Nanny, an even bigger one.
The themes of the story include those often used by Philip K. Dick, including technological advances and the use of androids, as he famously used in Do Androids Dream of Electric Sheep?. Here, the competing companies have wired the nannies to fight to the death, to destroy each other and force their owners to upgrade to newer, bigger, and more expensive models, something one of the characters becomes aware of, but in his rage, he still buys a new nanny.