Blizzard has given us back-to-back Timewalking Bonus weeks, and here are all of our articles on the pets that can be found from the dungeons, raids, and vendors during these events:
Wrath of the Lich King
Mists of Pandaria
The only one that doesn't have any pets is the Warlords of Draenor Timewalking.
We wish you all the best of luck on your mount & pet drops from the events, and until next time: Happy Battling!