Nigel Rifthold will only appear as a vendor once you've enticed him with some chocolate. He sells a number of pets for a various number of Polished Pet Charms - the new pet currency in Battle for Azeroth. Most will need to be unlocked by completing various questlines or a rare event. The co-ordinates are actually 52, 31 (not what I stated in the vid).
Bilefang Skitterer – 100
Crimson Frog - 100
Drustvar Piglet – 75 – complete the quests at Carver’s Harbour starting with (A) To Market, To Market.
Frenzied Cottontail – 300 – summon the Cottontail Matron from the Beastly Skull (rare event) in Glenbrook Hunting Grounds.
Smoochums – 200 – complete Abby Lewis’ quest - Teddies and Tea. See video - • Smoochums and Abby Lewis - Teddies and Tea
Edit: How to unlock the Alliance pet vendor in Patch 8.1: • How to Unlock the Pet Vendor Selling Allia...
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