In "Of Mice and Men," out of anger, what does Lennie do to the puppy?

Lennie, from John Stienbeck's Of Mice and Men, never
actually does anything to the puppies out of anger.  In reality, Lennie is simply
wanting to play with the puppies.  He, unfortunately, does not his own strength, or how
to handle puppies, and kills the one given to him.  After killing the puppy, Lennie
does, in fact, get angry at the puppy for dying.  The death of the puppy, for Lennie
symbolizes the death of his dream to tend to the rabbits at the ranch he and George wish
to have.  George had told Lennie that if he got into any more trouble that he would not
be able to tend to the rabbits on the ranch and Lennie sees the death of the puppy as
the end to his own dream.