Answer:
“brown and white one.”
Explanation:
Early in the novella, George promises Lennie that he will get him a puppy if he gets the chance, saying the puppy would be “better than mice.” So, when Lennie and George overhear Slim talking about his dog’s new litter, Lennie immediately perks up and excitedly asks George to talk to Slim about giving him a “brown and white one.”
