This guide is suitable for current RuneScape and Old School.
Speak with Halgrive outside the Church in East Ardougne. He'll tell you he's concerned about the plagued sheep and ask you to get rid of them by poisoning and incinerating them in a special place Farmer Brumty has set up. He'll give you Poisoned Sheep Feed and to get a Plague Suit from Doctor Orbon.
Go inside the Church and talk to Doctor Orbon. Pay him 100 Coins for a Plague Jacket and Plague Trousers. Head North out of Ardougne to the Incineration Enclosure. Put on the Plague Suit, go inside, and pick up the Cattleprod near the Incinerator.
Herding the Sheep
Head South to find the First Sick-Looking Sheep (Red). Use the Cattle Prodder to scare the Sheep and make it run away. Try to scare it into the Enclosure. The is no exact method on how to do this, but here are some hints that might help: Prod the Sheep, run a square away to where you think it will end up (you should be standing in the opposite direction you want it to go next and when it gets there prod it again. Once you have scared the sheep into the Enclosure, feed it with the poisoned food to kill it. Then pick up the Sheep Bones and burn them in the incinerator.
Repeat this process with the other 3 Sick-Looking Sheep located North-East of the Enclosure (Green), North-West of the Farm (Blue), and outside the Fishing Guild (Yellow). Once you've killed all the sheep and incinerated their bones, go back to Halgrive and talk to him to finish the quest
Congratulations! Quest Complete!
Guide Made by: PartyHatLove
Corrections submitted by: Deathslayer, Simon, Jei, PartyHatLove, Max, Nick D, Power of Five, Umbra