Animation Source Forums

Perhaps the wolf was the inspiration for your character of Fenris?

Well, keep this in mind; that you may have an all-black wolf character. This doesn't mean that no one else will, or it would not have been previously created.

Black wolves are the most simple to create and draw (including other animals with solid colors). It's like someone making an all-black Panther character and screaming "OMG" when someone draws a realistic black Panther. It's not uncommon to have "run-ins" like this.