Dreaming of killing a mouse means that you will defeat your opponent and your property or income will increase.
Dreaming of letting the mouse escape shows that it is doubtful whether your so-called struggle is justified.
Dreaming of catching mice indicates that you may suffer from making dishonest friends.
Dreaming of fighting with mice means that you are likely to have social obstacles and will encounter difficulties in interacting with people.
Dreaming of many mice indicates that you may encounter continuous failures or have strong sexual problems.