Fenrir wolf in Norse mythology. The child of Loki the god of mischief and giantess Angrboda.
I think I need to read more into Norse Mythology--- Norse Mythology is the bomb
"We're not allowed near here," Travis told me casually as he paid the guard and unhooked a thick chain from the ground. "Why not?" I asked. "Because of old Fenrir. They think he's dangerous and unpredictable." An enormous dog rose from the shadows and shook his head back and forth. "Is he?" "Yes. He's just like us."