A chill creeps through the timestream, and the howling of the undead scourge echos through the Caverns of Time. The Bronze dragons have once again called upon the heroes of Azeroth to battle the Infinite Dragonflight, and help preserve the timeline. This time we're being sent to Northrend, to battle the forces and allies of the Lich King. Though there aren't any pets to be found from the WotLK Timewalking dungeons, or the Timewalking Vendor -- Auzin -- there are some pets that can drop during this event.
The Ulduar raid in Storm Peaks is available for LFR Timewalking, and has a few pets that drop from the bosses.
These pets count toward the Raiding with Leashes IV: Wrath of the Lick King achievement.
Drop: Red-Hot Coal - Magma Rageling
Drop: Ironbound Collar - Ironbound Proto-Whelp
The Assembly of Iron
Drop: Stormforged Rune - Runeforged Servitor
Drop: Glittering Ball of Yarn - Sanctum Cub
Drop: Ominous Pile of Snow - Winter Rageling
Drop: Blessed Seed - Snaplasher
Drop: Overcomplicated Controller - G0-R41-0N Ultratonk
Drop: Wriggling Darkness - Creeping Tentacle
And those are all the pets connected to Wrath of the Lich King Timewalking!
Best of luck to you all on your drops, and happy battling!