Fetch: A Science Fiction Story
Should have been an easy job: get in, get the ore, get out. Then Molly Nomad's idiot brother-in-law Mickey lets the guard dog escape. Now Molly has to chase the dog across the asteroid and engage in a game of fetch.
Before she realizes it, the dog leads her to a mystery warehouse where Molly finds a secret worth far more than any pile of ore.
"Fetch" is a short story.