My boxer, Loki, is 4. And he has done this since he was a pup. He gets going so bad sometimes that it actually shakes the bed and wakes me up. Then I turn around and wake him up. He does the paws moving, the barking under his breath, and his little yelps. But I always wonder if they are all good dreams, Bc he has wetted the bed, and his bed, probably 3 or 4 times in his life span.