This one is freaking me out! No one knows what is wrong since it isn't health related.
My 2 year old Yorkie is afraid of something. He'll be laying on his bed and all of a sudden he'll pop his head up real quick and stare at something. Then he runs off to the corner. He's frightened and shaking all over. He'll keep staring at that area and then get more scared. I don't seem to sense anything at all. I'll scold at the area and tell my baby that its okay. No one has passed away recently in my apartment building...at least not that I know of.
Also it'll be real quiet and I'll be sitting there reading a book and he'll pop his head up and go sniff in that general area. Then his tail goes between his legs and his ears fold backwards and he runs off to the corner. It makes me feel so helpless to watch him shake.
Nothing has been changed like new additions. Furniture is the same setup. I keep the same routine with everything so nothing is out of place.