Just my own experiences with events I guess. I remember watching my dog walk over to a hallway at an old place and hunch down, then break out in barking and growling until I came over and checked myself on multiple occasions. Then later that night on one occasion she got up and started barking at my closed room door until I got up again to check as well. Also seeing things and apparitions, but I can attribute some of those to hallucinations from lack of sleep. Just my thoughts on it, but I can see as to why some don't believe.