Demonic Dog

I had just fallen asleep face down, and awoke in the dream world, similar to the waking world.

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Dream:
I climbed out of bed to investigate some sounds I was hearing outside of my room. There were several malicious men with weapons creeping about. I ducked back into my room and tried to think of a course of action.

Somewhere I thought I had a gun, but I could not think of where I had put it. Something brushed past me and I spun around to see what it was. There was a white dog in the room with me, sniffing things and bristling at me. I jumped back onto my bed to give it some space, hoping that the dog would leave me alone.

He calmed down some, and the voices of the men were dying down, but I didn't think they had actually left yet. I reached a friendly hand out for the white dog, who came close, snapped at me, and struck me with his front paw. It was at that moment that I realized it was not an ordinary beast, but something more sinister: almost demonic.

The dog begins to act more aggressive, and I try to hide face down on the bed and cover the back of my neck with one arm and my ears with the other. The evil dog tries biting at my arms, so I swing out at it in hopeless defense; it just provokes him further. [I wake up]
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I wake up in the same position I was in the dream, face down. I swing out at the air, but all is quiet. I bolt up and look over my shoulder, there is no dog because I am awake now.