In the quest "Curing the sick" for Druids (The part were you have to heal the deers):
-Use the item (Curative Animal Salve) on a "Sicly Deer".
-Right after the green bar is complete use "Moonfire (Rank 2)" on the "Sicly Deer".
When you do all of these steps, the "Sicly Deer" will be healed, and when he tranforms into the "Deer" and renews all of his health, the DOT of the "Moonfire (Rank 2)" will kill him.
This happens beacuse the "Sicly Deer" has more health than the "Deer". So, the "Moonfire (Rank 2) hits him after you cured, and he tranforms into a "Deer" but the DOT stays, so he dies.
That will count as 2 healed deers.
This is working on patch 1.7.1
Dunno if anyone already posted this, i'm sorry!