What is the dream interpretation for a black wolf?

I had dreamt of looking out my bedroom window to see a giant black wolf in the backyard standing by the trees, the only weird thing was that it was a giant wolf, like as tall as the trees. But he was just standing there staring at me as I stared back for quite a few minutes, i felt a little afraid but not too overwhelmed by fear. More curious. What does a black wolf symbolize in a dream?