Because he kept killing them all.
Lennie kept a dead mouse in his pocket because he enjoyed petting soft things and found comfort in touching the mouse's fur.
Lennie keeps a dead mouse in his pocket, which he likes to pet and take care of. Later, he goes searching for the dead mouse after realizing he has lost it.
George wants to give Lennie a pup so it attracts his attenion to something else, George thinks by doing this it will keep Lennie out of trouble. Also because George thinks a pup is bigger than a mouse so Lennie couldnt kill it easily.
He wants to pet it with his thumb
In "Of Mice and Men," Lennie tries to keep a puppy hidden from George so he won't be mad at him for accidentally killing it. Lennie's actions reveal his fear of disappointing George and his struggle to understand the consequences of his actions.
George gets angry with Lennie in the clearing because Lennie, despite being repeatedly told, insists on bringing a dead mouse with him - which goes against their plan to keep a low profile at their new job. George becomes frustrated with Lennie's inability to understand the consequences of his actions.
Lennie takes a dead mouse out of his pocket, which causes George to yell at him because he knows that Lennie's habit of petting soft things often leads to trouble. George doesn't want Lennie to get in trouble again.
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.
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.
A dead mouse
Lennie is like a mouse in the sense that he is gentle and innocent, but can unknowingly cause harm due to his size and strength. Like a mouse, Lennie also relies on George to protect and guide him in a world that he struggles to navigate on his own.
George didn't want Lennie to have a mouse because Lennie often pets animals too roughly, unintentionally causing harm. Additionally, George believed that having a mouse would contribute to Lennie's habit of getting into trouble and causing problems.