Brother Bear (2003)

Kenai is a young Indian who doesn't like bears at all. When his brother named Sitka was killed by one, Kenai, without any doubt, proceeds to kill the bear himself - only to be magically transformed into one. What makes this whole situation worse as it is, is because his other brother Denahi, wants to kill the bear that Kenai has transformed into. Kenai's one and only hope is a mystical mountain where he believes he can be returned back to his original form.