Animal Ghosts or, Animal Hauntings and the Hereafter by Elliott O’Donnell. London: William Rider & Son, Ltd. 1913.
This book is filled with first-person accounts of people meeting ghostly cats, dogs, horses, birds….
Elliott O’Donnell (1872-1965) is a famous ghost-hunter.
Thanks to Graeme Mackreth for post-processing this book!