If you have seen a killed mouse in a dream: They can give you very useful ideas on some issues, you can start something new in your fields of interest. To see a murdered mouse in a dream indicates entering the world house and establishing a happy home, establishing a new business for yourself and success in trade. As a different interpretation, it corresponds to tense days and sadness, good developments and gratitude. According to the Diyanet, it is a sign that he will help people in need and that the person will come out with good and profit at the end of this work.