This is a paid asset, but now you can download FOREST ANIMALS PACK for FREE, Please keep in mind this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
FOREST ANIMALS PACK v2.0
This pack currently includes 7 animals : bear, boar, fox, rabbit, deer stag, deer doe and wolf. the pack supports both PBR and Legacy shaders. Rig is set to mecanim generic. All animals have LODs. Animations are either in Place or with root Motion where applicable.