What did your dream-pig look like, and what was it doing?
What was your reaction to it, how were you feeling?
We often call someone a pig if they're behaving in a stupid or greedy way. Pigs wallow in mud, make grunting noises while eating, and are easily associated with dirt and basic desires.
Joseph Henderson in "Man and His Symbols" describes a woman's dream of "water pigs":
These are "water pigs", unknown to her as a species. They therefore would carry the meaning of a special type of animal, one that can live in two environments, in water or on the earth. This is the universal quality of the animal as a symbol of transcendence.