To dream of a pig represents selfish thoughts and overindulgence. Being greedy, selfish, and insensitive to others. You are preoccupied with your own pleasure and gain. Arrogance. Sexism or excessive sexual pleasure. A disgusting lack of self-control.
Alternatively, consider the saying "selfish bitch" or "selfish pig" in social situations you are dealing with.
Example: A young girl dreamed of a pig and wolf breathing down her neck and scaring her. In waking life her parents were very angry at her. The pig may have reflected her feelings about her motherly arrogantly agreeing with whatever her father said even when she knew her mother didn't really have an opinion of her own about the issue at hand.
Example 2: A man dreamed of seeing a pig rolling around in mud. In waking life he was having a lot of difficulty resisting watching pornography.