Over the last few years I’ve had a few dreams where I become lucid in a dream and find myself running on all fours. When this happens I think, “Well, this is odd, why am I running like this?” I then try to stand up, but I can’t. Typically I just keep running like that until I fade into the blackness of unconscious sleep.
One time when this happened I found myself running on all fours down a sidewalk, with a street to my left. Just as I was thinking about trying to stand upright I heard a noise to my right. I stopped in place, saw something small moving, and more or less against my will I began running towards the thing that moved. It suddenly occurred to me that the reason I was running on all fours was that I was a dog. “I” had my normal “I know I’m Alvin” consciousness, but I was in a dog’s body and I didn’t seem to have much control over the situation, I was just a passenger.