Mud in a dream commonly reflects the sense of being stuck -- progress that's slowed to a crawl, or effort that doesn't seem to be moving you anywhere. Struggling to pull your feet free can mirror real frustration with a situation that resists quick resolution, however hard you're actually working at it.
When a Planet is within five degrees of the cusp of any house, it shall be accounted to have virtue in that house though actually posited behind the cusp in another house. - Cardan Girolamo (1501-1576)