They are unpleasant and symbolize danger, poverty, filth, and illness. Your unconscious mind may be bringing up unpleasant images due to a disturbance in daily life.
The dream’s purpose is to make you aware of negative feelings that may encourage you to directly deal with the negativity in your life. Dreaming about rats leaves the dreamer feeling apprehensive and disgusted. Attempt to connect these feelings with those things that produce this type of anxiety during the day.... The Bedside Dream Dictionary
To dream of rats symbolizes the presence of extremely disagreeable or distasteful thoughts. Alternatively, it signifies feelings of uncertainty, guilt, envy, or other repressed emotions that are eating at you. It may also stand for someone who personifies the characteristics of a ‘rat.’ A black rat represents secrecy and deceptive acts.
A white rate is an omen that you will receive help from am unexpected source in your time of trouble and distress.
To dream that a rat is biting your feet portrays your daily life as a ‘rat race.’ You have a preoccupation with your ever busy waking life.... Dream Symbols and Analysis