That's like my grandma's house. She had an old cat and two old dogs, but they died a few years ago. She now has a young cat and dog, who do very odd things every now and then. They watch like something is walking in front of them, both of their heads moving in sync. Also, the cat (her name is Joy) will go upstairs and play with something. Its not the dog, because she cant climb steps. It seriously sounds like two different cats are up there. Her old cat, Babydoll, had a really odd meow, like a crying meow, and for a while after she died, i would hear it when I walked in. Her old dogs are there sometimes too. Before she got her new dog, we would still see dogs. It hadn't really hit that there should'nt be dogs, and they'd be there, then poof, they're gone. Other things happen alot there too, like we'd see a reflection that was'nt anyone in the room, or hear voices when we're by ourselves. It has happened to my grandma, me, and many other people.