Dog Sensing Spirits?

A series of photos showing a large orb-like mist with a dog sensing it. Is this proof of spirit or spirits?

"How are you? Here is a photo that proves dogs sense spirits." - Sandy

We love how there are three photos. So what caused the orb? Why is the dog seemingly aware of the ball of light if it is only the product of the camera flash and not really there?

"I have photographed the orb many times in my room. It's always the same size and changes positions in my bedroom. 

That evening, the dog was very agitated and wouldn't lay down as usual when we go upstairs. He kept jumping off the bed and when on the bed, looking up.
I live in a haunted area next to the Pickett's Mill battlefield historic site in Dallas, Georgia." - Sandy