Yes I do.
Mainly because of weird happenings since our last cat died.
Also, someone died in our house before we ever moved in and even if the house is empty, you never feel like you're alone. So its either the bloke that died, or our last cat is still around.
Back to our last cat... after he died we had him cremated and sometimes when my mum and i were in the same room, there would be a very sweet smell. I looked it up on the internet and read apparently it meant that the body/soul couldn't be corrupted and wouldn't rot. Odd I know. The smell would never happen when my dad was in the room because the cat didn't like him. Also, I've felt him walking across my bed.