Rogue Farm is a 2003 science fiction short story by British author Charles Stross.
In a world of biological fabricators, eight-legged cows, talking dogs, microscopic surveillance bots, and mid-life genetic upgrades, the main character, Joe, and his wife Maddie must defend their small farm from a terrifying threat.
Joe speaks with Wendy, who discreetly informs him (no small feat, given the tiny surveillance robots that spy on the citizens so that the police can prevent crime before it happens) that killing the creature will be necessary.
Because Maddie has become forlorn and uncommunicative, he tells his dog to clean out the bio fabricator and prepare the backup tapes to re-create his wife if necessary.
In the showdown between the monster and Joe, he has armed himself with liquid nitrogen and an extremely powerful tranquilizer dart.