You may read what you want in to this one, but at the time I strongly beleived that there was a 'ghost' of a dog lurking in the old house when I lived with my mother and step-dad. That house was over 100 years old, and that never concerned me at all, but some parts of the house were even older because it was technically a flat - but a rather odd shaped one. (a house on top of a small office and a place that is 'almost' acceptable as a house that used to be an old dental practice. yet our house had a celler and an attic... Anyway.)
I'll admit that one or two odd things did go on in there. But my trick was to simply ignore it or shout at it and the odd things would stop. Our next door neighbours used to have an old labraudor called Sophie. She was really old, but she kept coming in to our house and garden when she was let out in her garden for a 'potter'.
After she died, a friend of mine began to say she kept seeing glimpses of the black lab in my house. And sometimes when I was getting ready to take the dogs for a walk, the two spaniels would be going daft, knowing they are going for a walk, but I could swear I could hear a third dog nearby making silly noises and pounding their feet.
One of the Spaniels was an utter little sod, as he was still mostly a pup and out of control. He would chew things and run off with things and one of his favourite games was to run in to my bedroom and refuse to get out of there and would put up a fight with me when I tried to get him out.
One time when he ran in to my room, he did the usual game. He stood in the middle of the room and I was trying to drag him towards the door and suddenly he let out a yap, so I let go thinking I had hurt him (but it's impossible to break thast friggin' dog!) and he just stood there staring at the door, then he lept on the to box infront of the window onthe opposite side to the door and stood there watching intensly at the door. Suddenly, he began growling really seriously! and his fur was all sticking up on the back of his neck! He has never done that before! He was even shaking! When ever he played up or was in trouble, he would growl and snap at you, but it was never serious. He was bloody strong, and he could sometimes be a bit scary when he went to bite you, but it was only ever a game to him, and never serious, like fur up on his shoulders.
He was drooling from his mouth because he was growling so intensly and the fur was stuck up on end! His legs were trembling away! His eyes never tore away from the door. I looked all over the door and looked all around it and there was nothing there. I stepped out the room and he still never moved and growling away! So it clearly wasn't me he was growling at. This went on for a couple of minutes and I began to get quite frightened because I thought he was going to attack me if I tried to calm him down. But he finally seized and I gave him loads of fuss, he was still shaking and not quite 'himself' at all! I told him to get out my roomed and he left just with that command, but rather cautiously - he had never done that.. ever! He must have really had fear through him. After that he was glued to my side for the rest of the day.
The only thing I can think of that would cause him to do that would be old Sophie being on "his territory". (Sophie died before we got the Spaniel pup.)
But it was very strange. And a bit scary!