Answer:In Lennie accidently kills his puppy by being too rough with it. He is upset at the puppy for dying. He does not take responsibility for being too rough with the puppy and begins to worry about George's reaction. He fears that George will not allow him to tend rabbits and contemplates hiding the dead puppy.
Explanation:
Describe Lennie´s irrational anger when he does not understand about the puppy´s death. He is very angry, throws the dead puppy. Lennie keeps comparing the puppy to the mice; he doesn't know that the puppy can also be hurt, just like the mice.