Well, the on-going debate about the large, dog-like "Beast of Dartmoor" is very timely, as I have an article published in the new issue of Fate magazine that focuses on Phantom Black Dogs that have been seen in the vicinity of Britain's Cannock Chase woods.
As the article states in part: "Late one evening in early 1972, a man named Nigel Lea was driving across the Chase when his attention was suddenly drawn to a strange ball of glowing blue light that slammed into the ground some distance ahead of his vehicle, amid a veritable torrent of bright, fiery sparks. Needless to say, Lea quickly slowed his car down. As he approached the approximate area where the light had fallen, he was shocked and horrified to see looming before him, 'the biggest bloody dog I have ever seen in my life.'"
Here's the link to the Fate article.