"Animal Ghosts Or, Animal Hauntings and the Hereafter" is a paranormal non-fiction book written by Elliott O'Donnell. Published in 1913, the book explores the phenomenon of animal hauntings and the existence of spirits of deceased animals. O'Donnell, a renowned writer on supernatural topics, investigates various accounts and anecdotes of animal ghosts, ranging from domestic pets to wild animals. The book delves into the belief that animals have souls and can linger on as spirits after death, recounting chilling encounters, eerie apparitions, and unexplained behaviors. O'Donnell offers theories and interpretations regarding the nature of animal hauntings, drawing upon spiritualism, folklore, and personal experiences. He discusses the connections between animals and the spirit world, shedding light on the possibility of a hereafter for animals.