Animal Can See The Ghost?

I'm curious how animal can see the ghost.
Korea has sacrifice of holidays, these are public holiday. People make food and giving for them so we are open the door and window also. Some house have animals so we are put the animals into the room. Start the sacrifice, that time is very quite and we can hear sound of the breathing. We do not say anything but the animals barks and when I was young I asked to my family, why the animals barks? we do not say anything but why the animals is bark to the door? My parents said the animals see and smell the ghost, that's why they are barks. and I asked again, how animals can see the ghost? the family said animals' noise is very nice so can smell.

I asked to my friends and and find in Internet also. My friends said, the animals's noise is very nice so they can smell of the ghost but I cannot believe the this reason because how the ghost has smell they don't have body, they are spirits. But sometimes, I saw the articles of blogs. The articles said, When my dog bark to sky and he looked for something and bark to that and I'm curious I take a photo of there and I print the image, the image has strange of white something. I am not believe that is flash because the time was 4 or 5 o'clock and the place is kitchen. My kitchen doesn't have shiny things.


I believe ghost in the world, so when I was young I hear the animals can see the ghost to my family, I'm so afraid because I don't want to near with ghost but the animals barks to sky, this reason is they see the ghost so they are barks. The animals barks reason is afraid so they want to give scared to something.

Image by Flickr CC