He will take care of the rabbits on the farm.
Candy wanted to talk to Lennie about the dream of owning a piece of land with George and him. Candy offered to contribute money towards purchasing the land in exchange for being allowed to live there and work with them.
He wants to keep it, pet it, and name it George.
Because Lennie doesn't want to be away from his new pup.
The men think Lennie is armed because George tells them that Lennie has a gun. George does this to create the illusion of danger in order to protect Lennie from the other men on the farm who may want to harm him.
George and Lennie are attracted to the idea of owning a farm because it represents security, independence, and a place where they can live off the land and be their own bosses. For them, owning a farm symbolizes the possibility of achieving their dream of a better life and escaping the cycle of poverty and hardship they have experienced.
George's dream is to own a ranch with Lennie where they could do everything themselves. He didn't want to answer to anyone but himself. He also wanted to do all the work so he could get his own pleasure from it- not his bosses.
GEORGE killed LENNIE because Curley was going to find him and shoot him anyway. George wanted Lennie's last few moments to be happy, so he decided to do it himself and tell him a story beforehand.
Join Lennie and George's dream
Lennie is mental. So to keep lennie out of trouble George tells him stories about them having their own ranch. Plus rabbits. That's lennies favorite part. If lennie messes up then he can't tend the rabbits.
George doesn't want Lennie to drink the water because it might not be safe, especially if it's contaminated. Lennie has a habit of impulsively drinking from unknown sources, which could be harmful for his health. George is trying to protect Lennie from potential harm.
The main two main reasons why George didn't want Lennie to have a mouse are that he kills the mouse without knowing/realizing his own strength when the mice bite him, and Lennie bothers George by bringing that same mouse but Lennie doesn't know that bothers him. Lennie acts like a child mental.
George wants Lennie to stay away from Curley and his wife because he knows that Lennie is not able to understand social cues and may inadvertently get into trouble, especially with someone as volatile as Curley. He wants to protect Lennie from dangerous situations and avoid any conflict that could jeopardize their dream of owning a farm.