Black dogs are supernatural creatures which are apparently very fast-moving and have claws.
Wendigo
When the Winchesters were investigating the disappearances at Blackwater Ridge caused by a wendigo, Dean initially believed that the creature may have been a black dog based on its claws and speed, before discovering that it wasn't from the wendigo's elusiveness.
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Mystery Creatures
ActionLearn about the different Creatures of the world, Both evil and good, under the sea and above the clouds. If you can do a Cover for this book then Message me please that would be a great help :D