Mouse is the vehicle of Lord Ganesha therefore by worshipping silver mouse along with Lord Ganesha one gets rid of obstacles and attains peace, prosperity, intelligence and success. According to Ganesh Puran Lord Ganesha has a different vehicle in different yuga (Era).
In Satyuga lord Ganesha known as Vinayaka has ten arms and the vehicle is lion.
In Treta Yuga it's vehicle is peocock and lord Ganesha known as Mayureshwar has six arms. The color of lord Ganesha is white.
In Dwapar Yuga the red colored Gajanana has two arms and it's vehicle is mouse.
In Kalyuga lord Ganesha's Varn is Dhumra Varna and known as Dhumraketu, it has two arms and it's vehicle is horse.
Do not forget to worship silver mouse while chantin following Mantra of lord Ganesha - Om Gang Ganpatye Namah
Symbolic Mouse Meanings are -