Do dogs see ghosts?

For months, my wife has told me that our border collie is seeing ghosts in our home. i did not believe this, until i witnessed this myself. our dog, Mikey, is very intelligent. his IQ is equivalent to that of a three year old child. i was feeding Mikey a can of Pedigree one morning, when he suddenly stopped eating and looked over my shoulder to the ceiling. his ears dropped back and he slowly walked away and hid in the bathtub(his security blanket is our bathtub). since this one event, there have been other incidents of the same kind. Mikey looks up to the ceiling and goes to hide. Is Mikey seeing ghosts? we live on property that use to be a dairy farm that had slaves. we believe there are burial grounds on our property from that era. is this an isolated incident with our border collie or do other people experience the same type situation with their dog, that possibly sees “ghosts”?