Why did Shri Ganesh make mouse his vehicle?
Ganesh as we know is the son of Shiva and Parvati. His vehicle is a mouse named Dink. Being the lord of the ganas, he also has a name Ganapati. Ganapati is the god of wisdom and learning.
But have you ever noticed that his vehicle is not according to his physical structure? If your attention has gone towards this, then you must also have thought that his vehicle should have been a strong animal. Then why did he choose the mouse as his vehicle? Looking for a logical answer to this, it is known that even the mouse has a lot of passion(curiosity), due to which they try to find out what is inside it by bite off everything. And Lord Ganesha also gives him wisdom, in which the curiosity has great desire. And he is equally agile and also gives the message of being aware.
In ancient times there was an asura(demon) named Gajmukh. Gajmukh had a dream that he should take possession of the earth and the heavens as well. To fulfill this desire, he made a plan to please Lord Shiva one day. He went to a dense forest where he started penance of Shiva. Many years passed but he still stood on one leg and indulged in the penance of Shiva and kept chanting his name.
Bholenath was pleased with Gajmukh's penance and told him to ask for a boon. In the boon, Gajmukh said that no weapon of the universe could kill me, give me such a boon. Lord Shiva approved the boon by saying so be it. Gajmukh was very happy after getting a boon from Lord Shiva, he started to fulfill his wish. Soon he took possession of the Earth and Hades, after which he invaded heaven. Lord Shiva had a boon that no any weapon could kill him. That is why he did not suffer any damage from the divine weapons of the gods.
Gajmukh drove the gods out of Devaloka, after which all the gods reached the shelter of Trideva Brahma, Vishnu and Mahesh. After listening to the problem of the Gods, Bholenath told Lord Ganesha to fight with Gajmukh. Following the orders of Lord Shiva, Ganapati ji fought with Gajmukh.
Due to the boon of Bholenath, Lord Ganesha's weapon was not being effect on Gajmukh. So all the weapons of Ganapati also ended and became ineffective.
Meanwhile, Ganpati broke his one tooth and hit it on Gajmukh when he became unarmed for a moment. The tooth was not really an weapon, so it was proved infallible and Gajmukh was seriously injured. Despite this, Gajmukh did not give up. He took the form of a giant mouse from his maya(illusion) and started running towards Ganapati with full speed. When Ganpati saw Gajmukh coming towards him, he too started running towards Gajmukh at full speed and jumped & sat on his back. And Shri Ganesh transformed Gajmukh into a mouse for life.
Gajmukh tried his best to beat Ganpati and Ganesh also rode on his neck with full force. Gajmukh finally gave up after a long struggle. Even after this, Ganesh ji did not leave him. He said that you are a wicked by nature. That is why it would be better that you always remain my vehicle in the same way, so that I will always ride you and control your wickedness . Gajmukh accepted his command and became the vehicle of God.
There is a story in the Ganesh Purana on how Mouse became vehicle of Lord Ganesha. Which is somewhat similar to the first story.
In ancient times, there was a very beautiful ashram of the Saubhari Rishi on the Sumeru mountain. His very beautiful and loving wife was named Manomayi. One day the sage went to forest to get wood and Manomayi was engaged in housework. At the same time a wicked named Krounch Gandharva came there and was distraught when he saw amazing pretty Manomayi. Wicked Krounch held the hand of the sage-wife. The sage wife weeping and trembling started begging him for mercy. At the same time Saubhari rishi came. Due to anger, his eyes turned into red .
He cursed Gandharva and said- 'O vicious! You have come like a thief and have caught the hand of my wife, so you will fill your stomach by stealing under and around the earth. So you will be a mouse.
The trembling Gandharva prayed to the sage - 'O rishivar, I only touched your wife's hand due to indiscretion. Please forgive me. ' The sage said - 'My curse will not be in vain, however Ganapati Dev Gajmukh will appear in the form of Maharishi Parashar's son in Dwapar. Then you will become his vehicle, so that the gods will also respect you.
After many year , that Krounch Gandharva becoming a mouse and started to destroy the ashram of Maharishi Parashar on earth. That mouse was very huge and terrible like a mountain. His teeth were very big, sharp and frightening. Then his son Gajmukh grabbed that mouse by a stunning loop and started playing with him and sat on top of him. Then mouse came to know that this is Tarnahar(Saviour) Devadhidev Prabhu Gajmukh.
Then the pride of the mouse ended and he became very small. And he prayed that! 'O' Lord you may be so light for me, so that I can bear your weight. Hearing his humility, the Lord was pleased with him. From then onwards Mooshak (mouse) started getting respect and got fame as the vehicle of Sriganesh.
Gods chose their rides very specifically. Their vehicles also describe their characteristics. Mouse is the vehicle of Gauri putra Ganesha. The word Mushak(mouse) is derived from the Sanskrit Musha which means to rob or to steal. Symbolically the brain of a human is like a rat. It is surrounded by selfishness. Ganeshji sitting on a rat is a sign that he has conquered selfishness and has awakened the sense of public welfare within himself.
Ganesh Purana also describes that in every era, the vehicle of Ganesha keeps changing. In Satyuga, the vehicle of Ganesha is Lion. In Treta Yuga, Ganesha's vehicle is Mayur (Peacock) and in the present era i.e. Kali Yuga, his vehicle is horse. The present form of Lord Ganesha is worshiped in the form of Gajanan in the form of Parvati-Shiva son, this is the incarnation of his Dwapara era, Lord Ganesha in the Satyuga became famous as Mahotkat Vinayak, whose vehicle was lion. In Treta Yuga, he was known as Mayureshwar, whose vehicle was Mayur (peacock). His famous form of Dwapara Yuga is Gajanan, whose vehicle is a mouse and at the end of Kali Yuga, the Dhumraketu form of Lord Ganesha will be revealed. His vehicle will be horse. Lord Ganesha is also wealth giver.