Chronicles of ancient darkness
1) Wolf brother
Chronicles of ancient darkness volume 1
Katherine Tegen Books
6,000 years in the past, twelve-year-old Tarak and his guide, a wolf cub, set out on a dangerous journey to fulfill an oath the boy made to his dying father--to travel to the Mountain of the World Spirit seeking a way to destroy a demon-possessed bear that threatens all the clans.
5) Oath breaker
Chronicles of ancient darkness volume 5
When Bane is killed by the Soul-Eater Thiazzi, Torak sets off into the Deep Forest with his foster father and Renn to avenge his friend's murder, but they find themselves in the midst of a war between the Deep Forest clans.