To see a mouse in your dream indicates fear, meekness, insignificance and a lack of assertiveness. You are experiencing feelings of inadequacy and fears that you are not measuring up. The dream may be telling you that you are spending too much time hiding in the shadows of someone else. Alternatively, a mouse symbolises minor irritations and annoyances. Perhaps you are letting petty problems or insignificant issues eat away at you. The dream may also be a pun on a computer mouse and your connection to work or to the virtual world. 

To see a dead mouse in your dream implies that you are not letting minor issues bother you. You are not letting your own fears get in the way of what you want. Alternatively, a dead mouse indicates that there is something that you have ignored or neglected for too long.

To dream that you kill or trap a mouse suggests that others are making a big deal out of certain minor issues in your life.

To dream that you or someone is eating a mouse indicates that there is something nagging at your conscience. You need to get it off your chest. 

To dream that a mouse is being chased suggests that you are not standing up for yourself. You are letting others push you around.