In "Of Mice and Men," Curley's wife doesn't show sympathy for the dead puppy because she's frustrated and lonely.
Curley's wife is often isolated on the ranch, and her attempts to engage with the male workers are met with suspicion and hostility. Her reaction reflects her disappointment and loneliness when she finds the dead puppy.
She may not have had the emotional capacity to express sympathy for the puppy at that moment, as her unfulfilled dreams and isolation overshadow her ability to empathize with the plight of others, even a small animal.
In "Of Mice and Men", why didn’t Curley's wife not have sympathy for the dead puppy?