This way you can add the point of view shift as an added chapter, and long-time readers don't need to go searching through past chapters to find what you've updated.
Maybe you can do a Point of View shift and interlude of how the bond formed from the Dire Wolf's point of view to explain the process better? The wolf has a bad dream about Callum dying, and in the dream, he remembers the bonding process from his point of view.