Panther Cub
Source: Quest. It looked up at you with those huge black eyes and seemed to ask, 'Are you my mommy?' Beast type. This is still obtainable. I just did this today.
The 
Panther Cub is a companion pet rewarded from a quest chain that begins with Bwemba, available to both Horde and Alliance players in Northern Stranglethorn.
Guide awaiting review
Find Bwemba in Orgrimmar
Horde players can find Bwemba at 32.65, 68.15 in the Valley of Spirits/Orgrimmar Embassy area. Standing in front of the Embassy, walk down the path to your right and she will be on your left in front of a gazebo. Accept her initial quest to begin the chain.
Travel to Northern Stranglethorn
Follow the quest chain through these steps in order: accept Bwemba's initial quest, then complete To Bambala, Serpents and Poison, Spirits Are With Us, Nesingwary Will Know, and Track the — head toward Fort Livingston and look for Bwemba at 26, 29.6 in Northern Stranglethorn, as she accompanies you through the chain and provides several quests along the way.
Complete the Quest Chain
Finish the full quest chain in Northern Stranglethorn, which ends with Some Good Will Come (for both Horde and Alliance), rewarding you with the Panther Cub companion pet.
Tips
Bwemba's ghostly form can overlap with other clickable objects during the chain — if you still have her quest in your log without completing it, you can proceed through the chain without finishing it.
