This is but one of the many caged humanoids/beasts the Forsaken experiment on in the Undercity.

If you stand there while https://vanillawowdb.com/?npc=5734 Apothecary Keever is with the Caged Human Male/Female, you will see Keever do such things as:

• Apothecary Keever pokes the wooley sheep repeatedly.
• Apothecary Keever grabs the rabbit and pours the fluid down it's throat, then sets it back in the cage.
• Apothecary Keever pokes the skittish rabbit
• Apothecary Keever feeds the rabbit some viscous fluid.
• Apothecary Keever forces the fluid down the weary man's throat
• Apothecary Keever pokes the small toad.
• Apothecary Keever pokes the small fuzzy squirrel with obvious disappointment
• Apothecary Keever feeds the toad some strange liquid

Gotta love the undead!

He is turned by https://vanillawowdb.com/?npc=5734 Apothecary Keever into a:

https://vanillawowdb.com/?npc=5742 Caged Toad , https://vanillawowdb.com/?npc=5739 Caged Squirrel , https://vanillawowdb.com/?npc=5741 Caged Rabbit and https://vanillawowdb.com/?npc=5743 Caged Sheep

Also, its seems this Apothecary has created the first organic explosive sheep.

""Apothecary Keever grabs the rabbit and pours the fluid down it's throat, then sets it back in the cage.""

Apothecary Keever says: What is this? Did Keever ask for a sheep? Keever wanted a weapon of great power, and all he got was this sheep. Keever is very disappointed.

""Apothecary Keever pokes the wooley sheep repeatedly.""

*The sheep explodes and fire is sprayed everywhere for some reason*

Apothecary keever says: Keever is most pleased!

Apothecary Keever laughs.

-if you stand near the explosion you will be damaged slightly.
-perhaps keever was putress's apprentice?