GIF via Tenor We’ve spent the month discussing the many ways that animals, both domesticated and wild, can add wonderful color and layers of emotionally satisfying richness to a short story or novel. We’ve talked about how animal companions may become even more popular than the human protagonist who was supposed to be the star of any given series. But we have not explored how animals—that readers expect to always be warm and fuzzy—may in fact, be killer companions instead. Two instances jump immediately to mind. Sir Arthur Conon Doyle used animals as killers in two of his Sherlock Holmes titles. His third novel, The Hound of the Baskervilles , featured a large, spectral dog, the hound of the title, that was so eerie and terrifying in aspect that its mere appearance was enough to frighten victims to death. In Conon Doyle’s short story, The Adventure of the Speckled Band , the villain used a venomous snake trained to respond to his whistles. The snake slithered down a bell pull i...