Bulldogs World

Fatboy is slightly dragging his back leg when he walks.  It started last night.  My husband freaked out and woke me up to watch how he was walking.  He is not putting any pressure on his leg, but his back paw is dragging on the floor (not the entire leg).  He did jump off the couch recently, but he landed on his front legs first.  It didn't last too long before he was walking normal again, but then it started up again this morning when I took him out.  We are in the process of moving, so crating him will be easy.  But has anyone seen or experienced this?  He doesn't seem to be in pain.