Tail-wagging happy

I really wonder what dogs dream about. Devon must have amazing dreams. A lot of times she woofs or growls in her dreams. I wonder if those are nightmares, and I worry about her. This evening, I know she's having happy dreams! I heard a soft thump, thump, and I turned to see Devon wagging her tail in her sleep. Is she finding a leather article and earning her VST and CT? Her head is stretched up and her feet are forward, maybe she's earning her first High in Trial. Or maybe those are my dreams, and she's just saying hello to another friendly dog who wants to have fun!