Sentence:  It is my own opinion that the Black Shuck is another manifestation of <WSD>Fenrir</WSD>, the large and terrible wolf, who is the eldest child of Loki and the giantess Angrboda. 
Meaning of the word marked with <WSD> tags:  A monstrous wolf, one of Loki's offspring, who bites off Tyr's right hand while being bound by the gods in fear of a prophecy that he will kill Odin, remaining so bound until the events of Ragnarok.