Wolfie Blackheart is not an ordinary 18-year-old. She believes she is a wolf — technically, a werewolf — and so she wears a tail. She also wears a harness in case someone special wants to drag her around. And last week, she used a pocketknife in her kitchen to decapitate a dog — already dead, according to Wolfie — that had been missing since Jan. 5. “I severed the head, boiled the head,” Wolfie said. “People make the mistake of hacking the spine, which will fracture the skull.” She added, “You also have to put (the head) outside for the...