Dream Meaning of a mouse
If you have in a dream saw a mouse, expect difficulties in the home, and will follow you and a bad financial situation. If you catch a mouse, you will be successful and solve a problem that has been bothering you for a long time. If you have hunt a mouse , you will not have good luck, and if it was in a mousetrap, be careful in spending your money.
Definition I
A mouse (plural: mice) is a small rodent characteristically having a pointed snout, small rounded ears, a body-length scaly tail and a high breeding rate. The best known mouse species is the common house mouse (Mus musculus). It is also a popular pet. In some places, certain kinds of field mice are locally common. They are known to invade homes for food and shelter.
Link: https://en.wikipedia.org/wiki/Mouse
Definition II
a very small animal that has a pointed nose and a long, thin tail