The liver produces bile, and traditionally, bile is associated with anger. Therefore, if you dream about a liver it usually means that you are suppressing feelings of anger.
A painful or a diseased liver in a dream is a warning that negative emotions are having a harmful effect on you.
Eating liver, such as the liver of a chicken or a cow, represents an attempt to control negative emotions and to develop a more positive attitude toward life.
A dream about a liver can also reflect concerns about the health of your own liver, especially if you consume a lot of alcohol or if you have an unhealthy diet.