I don't think this is an image of a ghost dog, but rather a ghost image of a dog. In the old days you had to hold a pose for a photograph or it would make a ghostly image. I think the dog wandered into the shot and moved around, making a ghostly image.
looks more like an angry cat with puffed up fur to me...but then again when i see ghost animals they're usually clearer than this, so i dont know how to tell from a picture.
If this is a vintage photograph, you must remember it took time for the fil to be exposed. anything walking in and out of the shot turns into a ghjostly image, I have made several of these by slowing the shutter speed on a camera.
Dwayne G and faultyliving, you nailed it on the nosey, the dog didn't stay long enough for the exposure, look at the centering of the group, it was made to include the dog, thank you and good night.
This photo has been cropped. The original one has much more detail. Whoever scanned this photo used a very low resolution. For a better version of it, look in the new "Ripleys Believe it or Not" book that has just been release on books stores. The full photo was not square as seen on this site, which discredits "Gargryl's" theory.
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