The mouse is the animal of curiosity. The dreamer who sees the mouse in his dream is a person who gets his nose into others business. The mouse could also indicate silly and minor problems the one will have to deal with. The mouse that scares you, means that you will be shocked by ridiculous things in your waking life. The mouse could also symbolize some individual in your life that is quite annoying and makes you feel bad.
Read more about dreaming of Mouse in other dream meanings interpretations.