Curious Wolvar Pup is one of 2 possible rewards for completing the Dalaran (Northrend) Children’s Week quests. He comes from completing the quests associated with choosing the Wolvar Pup from Orphan Matron Aria.
My guide to Children’s week quests can be found here.
Curious Wolvar Pup’s Talents
Your battle pet will always have their first talent after you obtain them their other talents are opened at levels 2, 4, 10, 15 and 20.