Ok so I love the thought of wolves with wings. So I decided to go to the beginning and see how it came about. About Our Ancestors is where the stories of the first wolves that came to this planet are located.
As of this moment those stories are still being written. However they are not necessary to the current plot. Anyway back to the subject at hand. Two of the wolves received wings and so did their offspring. . . As the years went on the packs intermingled and so wings became a common thing.