what about -
a family pack of wolves are fighting through thw cold winter months. to keep dry and warm they enter a unknown den, in which is a wolf pup. all the pack except for the oldest, wisest one wants to take the pup into the pack as it is clearly abondoned. After a while of living with the pup they soon realise it has something wrong with it, it kills the old wolf secretly so the pack dosent know. As it grows up it gets interested in a village of humans and studies what they do. It then pretends to be a hunting dog to join the humans. It has to kill its pack to stay with the humans.
thats all i got , i was thinking in the end the pup could be rebprn as a human or somthin