Popeye has never lifted his tail before. We think he has at least some feeling there based on the pinch test that a physical therapist performed, but movement-wise, his tail has always remained limp. At most, the base has only twitched spasmodically.
But last week, as I was finishing up expressing him, his tail started wagging. Not in the same side to side motion that you associate with wagging tails, but it was definitely what I'd call wagging. He still doesn't do it very often and the few times have always been after I've just finished expressing him. I don't think he has any awareness or control over it, as the wagging doesn't seem to reflect excitement or any of the usual feelings that dogs have when they wag their tail. But just the fact that it actually lifted is pretty amazing.