(Sorry, this has nothing to do with Lancasters, but ghost dogs?)
As a very young, pre-school child I remembered often seeing a brown and black haired dog which always lay under my maternal grandfather's chair when he sat in it. It was an Airedale Terrier. I always thought it strange that it never seemed to come out from under that chair but never asked about it at the time or wanted to go near it because I was scared of dogs.
Many years later, as an adult, I mentioned it in passing to my mother, who told me I couldn't have seen it because the dog (which was devoted to my grandfather and always lay under his chair) had died a long time before I was born. She was shocked and amazed that I knew it was an Airedale because it was never talked about.