I wrote some time ago about different strange things that go on in my 125 year old house. These strange things don't bother me as they do not happen all the time.
Just last July I got my daughter a puppy she called Poppy, she is a miniature Jack Russell, we took her home and she settled in well with the family and even the cats. As with all the other animals in our house Poppy growls at the kitchen door or she will stare at it for ages. This does not unnerve me either. We put her bed into the kitchen under the radiator and she seems to like it as her own space at night.
One afternoon I was in the kitchen with all the family making the dinner when Poppy kept running up and down the stairs. The stairs are in the kitchen. I peered up the stairs and there was no one there. She would get up on her hind legs jump in the air and catch her ball then she would run up the stairs with it, return and wait a few minutes for it to be thrown down. But there was no one there to throw it, the ball wasn't bouncing down the stairs it was being thrown and she would wait a good few minutes for it to come down. Poppy has an invisible friend and this game goes on most of the day when the family are busy.
We often hear footsteps on the stairs like someone is trying to be really quiet on the stairs as to not to disturb anyone, but the steps creak and that is how we hear it. To who it is I do not know but Poppy totally enjoys their company. I get the feeling it could be a little girl as we have all seen or heard a little girl in the house. I'm not going to tell it to stop as perhaps our little dog is bringing some sort of happiness to a lonely soul.