Animal senses

This should probably go in spirituality but,,,
Has the thought ever crossed your mind that Dogs or cats, with different eye sight may be able to see spirits or ghosts? My dog barks at nothing and his ears go up, he even looks up as if there is someone there, staring at him. It kinda freaks me out sometimes. My first post in a while, now...Merry christmas(late)
What do you think?

Well, it could be possible seeing as dogs can hear much more high pitched sounds than we can so with different eye sight I suppose they could. Just like evryone's ense of colour, etc. is different because we all have unique eyes. So we all see differentally anyway. Maybe that's why some people can see ghosts?