If your dog See's a spirit or demon, calm down, count to ten. Dogs see things their not suppose to see. But if that happens, it might mean bad luck, karma, or something incredibly AWESOME. But beware of what you believe.
When you know your dog is going to get exited have her sit. Dogs can't go when sitting.
Maybe they sense that something is wrong when a dog sees you are afraid of them they know not to be afraid of you but if something is wrong they might want to give you some space.
Probably because it sees something like a cat or a chipmunk it can chase. But I don't know. I'm just guessing
Blindfoled
Living humans are not 100% completely sure they know God. Many do think they do.. Some say dogs are able to see spirits (ghosts). I, personally believe they do know God, after all, "dog" spelled backwards is God. =]
Messages travel from the dog's eyes to their brain.
When your dog stretches do see you he/she might be very happy to see you
no worries, it probably is just because the dog sees food that he or she really wants.
Salivating when it sees food
You're dog probably hears the noice and sees the movement and finds them interesing
You make sure the dog doesn't see a cat and if it does you keep them away from each other.
most of the time when you shoot a red laser on the ground. when the dog sees it, it goes charging at it. and when you put it on the wall (make sure it sees it) if it's low enough it will jump for it. when it is up high, it will bark at it.