Descendants

Au of Erin Hunter's book series, Survivors.

Matrix, is a wolf-dog hybrid who gets separated from her original when taken to a wolf-dog sanctuary along with her brother, Dagger. Matrix makes a plan to escape for her and her brother. When they escape they get in a fight and go their separate ways on bad terms. She finds a new pack but has to prove herself. When the pack finds out a new wolf who came a little after matrix did was actually a spy for a different pack, what will happen? Find out by reading Descendents.

All the characters are descendants of the original Survivors dogs.

(Might use some of the same names as the original survivors dogs idk yet tho)