I know there's a few photos of animal ghosts in the Fortean Picture Library including the one taken by an army officer in the 1920s showing his wife and their children, the older boy is holding a toy rabbit, but a ghostly kitten's head can be seen, such a heartbreaking story as the kitten was killed by a dog. However, I found a rare ghost dog photo online a few years ago, the site seemed to have disappeared, but I have rediscovered the photo recently.
It's only on one website and it's one of the best and clearest animal ghost photos I've seen. It was taken in the 60s and shows a boy holding a kitten with a truck behind them and the ghostly semi transparent image of a dog is seen in the window. The photo was taken by the boy's brother and the dog image wasn't noticed until years later. The website has a lot of information on ghost dogs and there's a more recent photo of a ghost dog under it. The website says "not secure" in the browser, so would it be safe to post?