Looks porky to me. Daylight pic of porcupine walking away from camera below.
I had a view just like this one right at dark while walking back to the truck after quail hunting. Instant panic set in because my little Beagle was between me and the spiny porker, and there was NO way to shoot past her with my I/C choked 28ga loaded with #8s. Screaming like a mad man got my dog's attention before she followed her nose to certain catastrophe.