Fry decides to hatch an egg instead of eating it. When the egg hatches it’s a bone eating vampire monster. It eventually becomes to big and dangerous to keep so they set it free on it’s home planet.
The Monster begins eating the sheep and the locals love it because it only eats their bones and gets rid of their excessive livestock. Leaving behind just the meat.
The episode ends with the gang eating "sheeptots" at a fast food restaurant.