The farm that George constantly describes to Lennie—those few acres of land on which they will grow their own food and tend their own livestock—is one of the most powerful symbols in the book. It seduces not only the other characters but also the reader, who, like the men, wants to believe in the possibility of the free, idyllic life it promises. Candy is immediately drawn in by the dream, and even the cynical Crooks hopes that Lennie and George will let him live there too. A paradise for men who want to be masters of their own lives, the farm represents the possibility of freedom, self-reliance, and protection from the cruelties of the world.
Because Lennie thinks in concrete terms of his own pleasure, he equates the tending of rabbits - whose soft fur he wishes to pet - with the attainment of utter happiness. Thus he has developed a shorthand for referring to the plan George and he share to start a farm of their own - "I remember about the rabbits" (5). Lennie takes deep pride in the notion that he would be entrusted to raise the rabbits, to protect them, to feed them out of their alfalfa patch. He places the entirety of his future happiness on this one image of caring for rabbits.
Indeed, his only thought after doing something "bad" - whether killing a puppy or killing Curley's wife, all "bad things" seem roughly equivalent in Lennie's mind - is that George will not allow him to tend the rabbits.