In the beginning of the story George and Lennie sit by the fire and talk about their dream. Their dream is to own a house and have a bunch of animals with tons of acres of land. Their dream is a plan for the future, foreshadowing that it will not end up working out. But it does show that anyone and everyone can have a dream.
Towards the middle of the book, Candy's dog gets shot by Carlson. Candy gets upset because he thought he should of shot the dog, since it was his. Candy and his dog are foils of George and Lennie. Both pairs are each other's best friend, and do everything for each other. Best friends have to make sacifices for each other, like they do.
By the end of the book, Curley's wife lets Lennie touch her hair since it was soft. He started petting too hard and she started screaming. Lennie told her to stop screaming or he'll get in trouble, and ending up snapping her neck by accident. This is the climax of the story because Lennie and George's dream gets crushed. Like Lennie and George's dream, we sometimes ruin our own dreams.
In the last chapter, George goes to find Lennie in the woods. Before the other men try to kill Lennie, George did it. The death of Lennie is symbolic for the death of their dream. The best plans Of Mice and Men often go away. Dreams are ware away after while.