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.
Planets in fixed signs show the matter durable; in bicorporeal signs, doubtful; in movable, convertible to good or evil. - William Lilly (1602.-1681.)