To dream of growling may represent repressed anger or unexpressed dissatisfaction. You may be holding back your negative feelings and need to let them out. Feeling uncomfortable around someone that is irritated by you.
Alternatively, growling may represent a growing discomfort that is being subtlety communicated to you in some manner. Body language or an attitude problem that someone is beginning to display to you. You or someone else that feels that their nerves are being pushed.