Overall, this really does cause a cluster of problems that might or might not need to deal with. Those don't sound like the ghosts of animals at all. They sound like spirits. Up to and including (probably especially) these "contracts" You're definitely crossing over two things White Wolf likes to sharply demarcate. There are consequences to the setting if you do this. Particularly if werewolves are an issue you might want to bring in.
Moreover, why aren't there contracts with the between Western civilization and their animal ghosts? Lots of animals are really important in many of those cultures. Where are the pet dogs? Cats? (Though cats probably do their own thing after death) The scary and or important animals of those cultures? (Bears, wolves, lions, aurochs, swans, stags, etc.)