I always dog sit the neighbor's dog, Emo. I just go over and check on him every little while and of course I stop and play with him for a half an hour or so.
anyway, I'm watching him this weekend. every time I watch him I notice that he barks/stares at NOTHING. at least...nothing I can see. I was just over there before sitting on the couch and he was just sitting there staring at the wall. I ignored it because he's kind of strange (lol) but then he got up and started barking at it. just this ONE spot. It freaks me out because I think that dogs have a sixth sense type thing..and they can see things that we can't.